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## Big Ideas Math Book 1st Grade Answer Key Chapter 9 Add Two-Digit Numbers

Start your preparation by taking help from Big Ideas Math Book 1st Grade Solution Key Chapter 9 Add Two-Digit Numbers and learn the concepts from practice tests, cumulative tests, and others. Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers helps both Students and Teachers out there to get all the concepts underlying. Score good marks in your exams with the help of Big Ideas Math Book 1st Grade Answer Key Chapter 9 Add Two-Digit Numbers.

**Vocabulary**

**Lesson: 1 Add Tens and Ones**

**Lesson: 2 Add Tens and Ones Using a Number Line**

**Lesson: 3 Make a 10 to Add**

**Lesson: 4 Add Two-Digit Numbers**

**Lesson: 5 Practice Addition Strategies**

**Lesson: 6 Problem Solving: Addition**

**Chapter-9: Add Two-Digit Numbers**

### Add Two-Digit Numbers Vocabulary

**Organize It**

Review Words:

120 chart

column

ones

row

tens

Answer:

Tens and ones.

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 3 lines 3 x 10 = 30.

In ones row there 7 boxes 7 x 1 = 7

so, total there are 37

**Define It**

Use the review words to complete the puzzle.

Answer:

1) 120Chart

2) Column

3)Row

Explanation:

First figure shows the numbers from 1 to 120.

The vocabulary for the figure is 120 chart which is represented in the figure horizontally.

Second figure shows columns colored

The vocabulary for second figure is column

Third figure shows rows colored

The vocabulary for the third figure is row

### Lesson 9.1 Add Tens and Ones

**Explore and Grow**

Show how you can use a model to solve.

32 + 7 = _________

Answer:

32 + 7= 39 Three tens and 9 ones.

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 3 lines 3 x 10 = 30.

In ones row there 9 boxes 9 x 1 = 9

so, total there are 39

**Show and Grow**

Question 1.

25 + 12 = _________

Answer:

25 + 12 = 37 Three tens and 7 ones

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 2 lines 2 x 10 = 20.

In ones row there 5 boxes 5 x 1 = 5

so, total there are 25.

The first row represents the tens and second row represents the ones

In tens row there are 1 lines 1 x 10 = 10.

In ones row there 2 boxes 2 x 1 = 2

so, total there are 12

By adding both the numbers the answer is 37.

Question 2.

36 + 3 = __________

Answer:

36 +3= 39, three tens and 9 ones

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 3 lines 3 x 10 = 30.

In ones row there 6 boxes 6 x 1 = 6

so, total there are 36.

The first row represents the tens and second row represents the ones

In tens row there are 0 lines 0 x 10 = 0.

In ones row there 3 boxes 3 x 1 = 3

so, total there are 3

By adding both the numbers the answer is 39.

Question 3.

21 + 8 = __________

Answer:

21+ 8 = 29, 2 tens and 9 ones.

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 2 lines 2 x 10 = 20.

In ones row there 1 boxes 1 x 1 = 1

so, total there are 1.

The first row represents the tens and second row represents the ones

In tens row there are 0 lines 0 x 10 = 0.

In ones row there 8 boxes 8 x 1 = 8

so, total there are 8

By adding both the numbers the answer is 29.

Question 4.

22 + 24 = __________

Answer:

22 + 24 = 46, 4 tens and 6 ones

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 2 lines 2 x 10 = 20.

In ones row there 2 boxes 2 x 1 = 2

so, total there are 22.

The first row represents the tens and second row represents the ones

In tens row there are 2 lines 2 x 10 = 20.

In ones row there 4 boxes 4 x 1 = 4

so, total there are 24

By adding both the numbers the answer is 46.

**Apply and Grow: Practice**

Question 5.

34 + 4 = __________

Answer:

34 + 4 = 38, 3 tens and 8 ones.

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 3 lines 3 x 10 = 30.

In ones row there 4 boxes 4 x 1 = 4

so, total there are 34.

The first row represents the tens and second row represents the ones

In tens row there are 0 lines 0 x 10 = 0.

In ones row there 4 boxes 4 x 1 = 4

so, total there are 4

By adding both the numbers the answer is 38.

Question 6.

43 + 15 = __________

Answer:

43 + 15 = 58, 5 tens and 8 ones.

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 4 lines 4 x 10 = 40.

In ones row there 3 boxes 3 x 1 = 3

so, total there are 43.

The first row represents the tens and second row represents the ones

In tens row there are 1 lines 1 x 10 = 10.

In ones row there 5 boxes 5 x 1 = 5.

so, total there are 15

By adding both the numbers the answer is 58.

Question 7.

71 + 20 = __________

Answer:

71 + 20 = 91,

9 tens and 1 ones.

Explanation:

The number of choclates with rim is 71

The number of choclates with jim is 20

Total number of choclates is 91.

Question 8.

93 + 6 = __________

Answer:

93 + 6 = 99,

9 tens and 9 ones.

Explanation:

The number of choclates with rim is 93

The number of choclates with jim is 6

Total number of choclates is 99

Question 9.

55 + 23 = __________

Answer:

55 + 23 = 78, 7 tens and 8 ones.

Explanation:

The number of choclates with rim is 55

The number of choclates with jim is 23

Total number of choclates is 78.

Question 10.

62 + 32 = __________

Answer:

62 + 32 = 94, 9 tens and 4 ones.

Explanation:

The number of choclates with rim is 62

The number of choclates with jim is 32

Total number of choclates is 94.

Question 11.

**MP Reasoning**

Circle the number to complete the equation.

Answer:

41 + 5 = 46,

Circled the number 5.

**Think and Grow: Modeling Real Life**

You watch television for 24 minutes in the morning and 32 minutes at night. How many minutes do you spend watching television in all?

Addition equation:

Model:

___________ minutes

Answer: 56

Explanation:

Models: television,

24 minutes in the morning and 32 minutes in the night

24 + 32 = 56.

**Show and Grow**

Question 12.

You do 42 jumping jacks in the morning and 46 at night. How many jumping jacks do you do in all?

Addition equation:

Model:

___________ jumping jacks

Answer: 88

Explanation:

Models : Jumping jacks,

42 jumping jacks in the morning and 46 in the night

42 + 46 = 88. 88 Jumping jacks

### Add Tens and Ones Practice 9.1

Question 1.

42 + 7 = _________

Answer:

42 + 7 = 49, 4 tens and 9 ones.

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 4 lines 4 x 10 = 40.

In ones row there 2 boxes 2 x 1 = 2.

so, total there are 42.

The first row represents the tens and second row represents the ones

In tens row there are 0 lines 0 x 10 = 0.

In ones row there 7 boxes 7 x 1 = 7

so, total there are 7

By adding both the numbers the answer is 49.

Question 2.

61 + 35 = __________

Answer:

61 + 35 = 96, 9 tens and 6 ones.

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 6 lines 6 x 10 = 60.

In ones row there 1 boxes 1 x 1 = 1

so, total there are 61.

The first row represents the tens and second row represents the ones

In tens row there are 3 lines 3 x 10 = 30.

In ones row there 5 boxes 5 x 1 = 5

so, total there are 35

By adding both the numbers the answer is 96.

Question 3.

74 + 11 = __________

Answer:

74 + 11 = 85, 8 tens and 5 ones.

Explanation:

The number of choclates with rim is 74

The number of choclates with jim is 11

Total number of choclates is 85.

Question 4.

86 + 2 = ___________

Answer:

86 + 2 = 88, 8 tens and 8 ones.

Explanation:

The number of choclates with rim is 86

The number of choclates with jim is 2

Total number of choclates is 88.

Question 5.

**MP Reasoning**

Circle the number to complete the equation.

Answer:

22 + 70 = 92, circled the 70 to complete the number.

Question 6.

**Modeling Real Life**

You eat 33 grapes. Your friend eats 23 grapes. How many grapes do you and your friend eat in all?

___________ grapes

Answer: 55

Explanation:

Me ate 33 and my friend ate 23 in all

33 + 23 = 55.

We bote ate 55 in all.

**Review & Refresh**

Question 7.

__________ tens and _________ ones is _________ .

Answer:

8 tens and 2 ones is 82

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 8 lines 8 x 10 = 80.

In ones row there 2 boxes 2 x 1 = 2

so, total there are 82.

Question 8.

__________ tens and _________ ones is _________ .

Answer:

4 tens and 6 ones is 46

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 4 lines 4 x 10 = 40.

In ones row there 6 boxes 6 x 1 = 6

so, total there are 46.

### Lesson 9.2 Add Tens and Ones Using a Number Line

**Explore and Grow**

Color to show how you can use the hundred chart to find the sum.

23 + 34 = ___________

Answer:

23 + 34 = 57,

5 tens and 7 ones.

Explanation:

In the below figure 120 chart is shown in that 23 and 34 are colored

that two numbers are added

to get the total sum.

**Show and Grow**

Question 1.

22 + 7 = __________

Answer: 29

Explanation:

22 + 7 = 29,

the addition is represented on number line

Question 2.

35 + 41 = __________

Answer:

35 + 41 = 76.

Explanation:

35 + 41 is represented on the number line.

**Apply and Grow: practice**

Question 3.

53 + 40 = _________

Answer:

53 + 40 = 93.

Question 4.

82 + 12 = __________

Answer: 82 + 12 = 94.

Question 5.

48 + 31 = ___________

Answer: 48 + 31 = 79.

From the above equation 48 is marked and from that point

3 points with 10 are taken and 1 with one is taken

48 + 31 = 79

Question 6.

**MP Structure**

Write an equation that matches the number line.

Answer: 37 + 23 = 60

Explanation:

From the point 37 to 60

2 points with 10 are taken and 3 points with 1 are taken

so, the total equation is 37 + 23 = 60.

**Think and Grow: Modeling Real Life**

The home team scores 37 points. The visiting team scores 22 more. How many points does the visiting team score?

Addition equation:

Model:

__________ points

Answer: 37 + 22 = 59

Explanation:

A point on the number line is taken as 37

From there 2 poins with 10 that is 20

From there 2 more points with 2 are taken

total it makes 22

**Show and Grow**

Question 7.

Your friend scores 63 points. You score 25 more than your friend. How many points do you score?

Addition equation:

Model:

__________ points

Answer: 63 + 25 = 88

Explanation:

A point on the number line is taken as 63

From there 2 poins with 10 that is 20

From there 5 more points with 5 are taken

total it makes 88.

### Add Tens and Ones Using a Number Line Practice 9.2

Question 1.

13 + 60 = __________

Answer: 73

Question 2.

81 + 8 = _____________

Answer: 89

Question 3.

56 + 42 = ____________

Answer: 98

Question 4.

**MP Structure**

Write an equation that matches the number line.

Answer: 17 + 41= 58

Question 5.

**Modeling Real Life**

There are 36 black keys on a piano. There are 16 more white keys than black keys. How many white keys are there?

____________ white keys

Answer: 52 white keys

**Review & Refresh**

Question 6.

3 + 7 + 4 = ___________

Answer: 14

Question 7.

4 + 5 + 6 = ___________

Answer: 15

### Lesson 9.3 Make a 10 to Add

**Explore and Grow**

How can you use the model to solve?

38 + 6 = ___________

Answer:

38 + 6 = 44

Explanation:

The first row represents the tens and second row represents the ones

In tens row there are 3 lines 3 x 10 = 30.

In ones row there 8 boxes 8 x 1 = 8

so, total there are 38.

The first row represents the tens and second row represents the ones

In tens row there are 0 lines 0 x 10 = 0.

In ones row there 6 boxes 6 x 1 = 6

so, total there are 6

By adding both the numbers the answer is 44.

Count one numbers from both the sides 8 + 6 = 14

It has 10 in it

**Show and Grow**

Question 1.

41 + 7 = ___________

Make a 10? Yes No

Answer: No

Explanation:

By adding ones place from both the sides

1 + 7 = 8

So, the answer is no

Question 2.

56 + 8 = ___________

Make a 10? Yes No

Answer: Yes

Explanation:

By adding ones place from both the sides

6 + 8 = 14

So, there is 10 in it.

**Apply and Grow: Practice**

Question 3.

72 + 4 = _________

Make a 10? Yes No

Answer: No

Explanation:

By adding ones place from both the sides

2 + 4 = 6

So, There is no 10 in it.

Question 4.

63 + 9 = ___________

Make a 10? Yes No

Answer: Yes

Explanation:

By adding ones place from both the sides

3 + 9 = 11

So, there is 10 in it.

Question 5.

14 + 6 = __________

Make a 10? Yes No

Answer: Yes

Explanation:

By adding ones place from both the sides

4 + 6 = 10

so, there is 10 in it.

Question 6.

27 + 5 = __________

Make a 10? Yes No

Answer: Yes

Explanation:

By adding ones place from both the sides

7 + 5 = 12

So, there is 10 in it.

Question 7.

46 + 7 = ___________

Make a 10? Yes No

Answer: Yes

Explanation:

By adding ones place from both the sides

6 + 7 = 13

So, there is 10 in it

Question 8.

81 + 8 = ___________

Make a 10? Yes No

Answer: No

Explanation:

By adding ones place from both the sides

1 + 8 = 9

so, there is 10 in it.

**MP Logic**

Complete.

Question 9.

Answer: 62

Explanation:

56 + 6 = 62

56 + 4 makes 60 and 4 + 2 = 6

6 is divided as 4 + 2

60 + 2

Question 10.

Answer: 48

Explanation:

39 + 9 = 48

39 + 1 = 40, 9 is divided to 1 and 8.

**Think and Grow: Modeling Real Life**

You put 17 puzzle pieces together. There are 7 left. How many puzzle pieces are there in all?

Addition equation:

Model:

Make a 10? Yes No

___________ Puzzle pieces

Answer: Yes.

Explanation:

17 puzzle pieces are together

7 added to it

17 + 7 = 24

The ones place of both sides are added 7 + 7 = 14

so, there is ten in it.

**Show and Grow**

Question 11.

You color 46 states. There are 4 left. How many states are there in all?

Addition equation:

Model:

Make a 10? Yes No

___________ States

Answer: 50

Explanation:

Colored states are 46

uncolored states are 4

Total states are 46 + 4 = 50

6 + 4 = 10

Both the sides ones places are added

### Make a 10 to Add Practice 9.3

Question 1.

66 + 5 = __________

Make a 10? Yes No

Answer: yes

Explanation:

Number of lines which represents 10 is 6 that in tens place

in ones place both the sides 6 + 5 = 11

so, there is 10 in it

Question 2.

74 + 3 = ____________

Make a 10? Yes No

Answer: No

Explanation:

Number of lines which represents 10 is 7 that in tens place

in ones place both the sides 4 + 3 = 7.

so, there is no 10 in it.

Question 3.

28 + 8 _____________

Make a 10? Yes No

Answer: Yes

Explanation:

2 represents tens place 2 x 10 = 20

In ones place from both the sides 8 + 8 = 16

so, There is ten in it.

Question 4.

52 + 9 = ______________

Make a 10? Yes No

Answer: Yes

Explanation:

5 represents tens place 5 x 10 = 50

In ones place from both the sides 2 + 9 = 11

so, There is ten in it.

52 + 9 = 61.

Question 5.

26 + 7 = ____________

Make a 10? Yes No

Answer: yes

Explanation:

2 represents tens place 2 x 10 = 20

In ones place from both the sides 6 + 7 = 13

so, There is ten in it.

26 + 7 = 33.

Question 6.

41 + 6 = ____________

Make a 10? Yes No

Answer: No

Explanation:

4 represents tens place 4 x 10 = 40

In ones place from both the sides 1 + 6 = 7

so, There is no ten in it.

41 + 6 = 47.

**MP Logic**

Complete.

Question 7.

Answer: 41

Explanation:

37 + 4 = 41

4 is divided to 3 and 1

37 + 3 = 40

40 plus 1 is 41

Question 8.

Answer: 54

Explanation:

48 + 6 = 54

6 is divided in to 2 and 4

48 + 2 = 50 So, there is ten in it

50 + 4 = 54

Question 9.

**Modeling Real Life**

A snake lays 24 eggs. Another snake lays 9 eggs. How many eggs are there in all?

Answer:

33 eggs

Explanation:

A snake lays 24 eggs

another snake lays 9

there are 33 eggs in all.

**Review & Refresh**

Question 10.

Color the shapes that have 4 vertices.

Answer: Square and rectangle

Explanation:

For a square there are 4 vertices and for a rectangle there are 4 vertices. vertices are Nothing but corners or joining of the two lines.

### Lesson 9.4 Add Two-Digit Numbers

**Explore and Grow**

Show how you can use a model to solve.

43 + 28 = _________

Answer: 43 + 28 = 61

Explanation:

4 tens and 3 ones

2 tens and 8 ones

The figure shows lines represents tens and

circls represent ones

**Show and Grow**

Question 1.

39 + 45 = ?

___________ tens __________ ones

Answer: 7 tens and 14 ones

Explanation:

The figure shows 39 represents 3 tens and 9 ones

and 4 tens 5 ones

3 + 4 = 7 and 9 + 5 = 14.

**Apply and Grow: Practice**

Question 2.

19 + 35 = ?

Answer: 1 + 3 = 4 and 9 + 5 = 14

Explanation:

First figure shows 1 tens and 9 ones

3 tens and 5 ones

The second figure shows 1 + 3 = 4

and 9 + 5 = 14

Question 3.

Answer: 60

Explanation:

43 + 17 = 60

In the 4 and 3 are in tens place and 3 and 7 are in ones place

My friend has 43 choclates and me has 17 more of it.

Total choclates is 60.

Question 4.

Answer: 81

Explanation:

67 + 41 = 81

my friend jim has 67 lollipops

and rim has 41 lollipops

in total jim and rim has 81 lollipops.

Question 5.

**YOU BE THE TEACHER**

Is the sum correct? Explain.

Answer: 76

Explanation:

58 + 28 = 76

The line represents 10 and circles represents 1

5 tens and 8 ones

2 tens and 8 ones

by adding 8 from the both places we get 16 and there is 10 in it.

**Think and Grow: Modeling Real Life**

You earn a sticker for every 10 pages you read. You read 34 pages one week and 37 the next. How many stickers do you earn?

Addition problem:

Model:

Write the missing numbers:

_________ tens _________ one

__________ stickers

Answer: 71

Explanation:

I earn a sticker for every 10 pages

first I read 34 pages and then 37 pages

34 + 37 = 71

so, total 71 pages for every 10 pages 1 sticker 7 stickers

**Show and Grow**

Question 6.

You earn a coin for every lo cans you recycle. You recycle 18 cans one week and 25 the next. How many coins do you earn?

Addition problem:

Model:

Write the missing numbers:

_________ tens _________ one

__________ coins

Answer: 4 tens and 3 ones 4 coins

Explanation:

If I recycle 10 cans I get 1 coin

in first week i recycled 18 cans and in next week 25 cans

18 + 25 = 43.

### Add Two-Digit Numbers Practice 9.4

Question 1.

57 + 15 = ?

Answer: 57 + 15 = 72

Explanation:

In 57 5 tens and 7 ones

in 15 1 tens and 5 ones

If we add both we get 7 tens and 2 ones.

Question 2.

Answer: 76

Explanation:

In 40 4 tens and 0 ones

in 36 3 tens and 6 ones

if we add both we get 7 tens and 6 ones.

Question 3.

Answer: 81

Explanation:

In 29 2 tens and 9 ones

in 52 5 tens and 2 ones

If we add both 29 and 52 is 81

8 tens and 1 ones.

Question 4.

**DIG DEEPER!**

Do you need to use the make a 10 strategy to find each sum?

28 + 34 = ? Yes No

56 + 15 = ? Yes No

42 + 21 = ? Yes No

68 + 11 = ? Yes No

Answer:

28 + 34 = 62 Yes

56 + 15 = 71 Yes

42 + 21 = 63 No

68 + 11 = 79 No

Explanation:

In first sum 28 + 34

if we take 8 and 4 and add we get 12 taken from ones place

we get 10 in it.

In second sum 56 + 15

if we take 6 and 5 and add we get 11 taken from ones place

we get 10 in it.

In third sum 42 + 21

if we take 2 and 1 and add we get 3 taken from ones place

we didn’t get 10 in it

In fourth sum 68 + 11

if we take 8 and 1 and add we get 9 taken from ones place

we didn’t get 10 in it.

Question 5.

You need a box for every 10 muffins you make. You make 33 blueberry muffins and 47 banana muffins. How many boxes do you need?

__________ boxes

Answer: 8 boxes

Explanation:

We need a box for 10 muffins that we make

We made 33 blueberry muffins

and 47 banana muffins

if we add we get 33 + 47 = 80

so, I get 8 boxes.

**Review & Refresh**

Question 6.

Is the equation true or false?

Answer: 15 = 16 false

Explanation:

6+ 9 = 15 and 17 – 1= 16

15 is not equal to 16

### Lesson 9.5 Practice Addition Strategies

**Explore and Grow**

Show two ways you can find the sum.

23 + 39 = __________

23 + 39 = __________

Answer: 23 + 39 = 62

Explanation: one method

second method

**Show and Grow**

Question 1.

47 + 24 = ________

Answer: 72

Explanation:

4 tens and 7 ones

2 tens and 4 ones

tens represents the lines and ones represents the circles

Question 2.

38 + 43 = ________

Answer: 81

Explanation:

3 tens and 8 ones

4 tens and 3 ones

tens represents the lines and ones represents circles

**Apply and Grow: Practice**

Question 3.

22 + 18 = ________

Answer: 40

Explanation:

2 tens and 2 ones

1 tens and 8 ones

tens represents the lines and ones represents the circles

Question 4.

57 + 34 = __________

Answer: 91

Explanation:

5 tens and 7 ones

3 tens and 4 ones

lines represents the tens and circles represents the ones

Question 5.

73 + 19 = __________

Answer: 92

Explanation:

lines represents the tens and circles represents the ones

7 ten and 3 ones

1 tens and 9 ones

Question 6.

81 + 11 = __________

Answer: 92

Explanation:

the lines represents tens and the circles represents ones

8 tens and 1 ones

1 tens and 1 ones

If we add both we get

92

Question 7.

**YOU BE THE TEACHER**

Is the sum correct? Explain.

Answer: No

Explanation:

no the sum is not correct.

But figure shown is correct

17 + 26 = 43

**Think and Grow: Modeling Real Life**

You hove 48 songs. Your friend has 27 more than you. How many songs does your friend have?

Addition equation:

Model:

____________ songs

Answer: 75 songs

Explanation:

Model : songs

I have 48 songs

and my friend had 27 more than me

Total songs that my friend had is 48 + 27 = 75 songs

**Show and Grow**

Question 8.

Your friend sells 56 candles. You sell 35 more than your friend. How many candles do you sell?

Addition equation:

Model:

____________ candles

Answer: 91 candles

Explanation:

Models: candles

My friend has 56 candles

and me has 35 more than my friend

so, I had 91 candles with me

### Practice Addition Strategies Practice 9.5

Question 1.

62 + 29 = _______

Answer: 99

Explanation:

6 tens and 2 ones

2 tens and 9 ones

by adding both the numbers i get is 99

Question 2.

84 + 8 = ________

Answer: 92

Explanation:

8 tens and 4 ones

0 tens and 8 ones

by adding both the numbers i get is 92

Question 3.

75 + 17 = ________

Answer: 92

Explanation:

7 tens and 5 ones

1 tens and 7 ones

by adding both the numbers i get is 92

Question 4.

**YOU BE THE TEACHER**

Is the sum correct? Explain.

Answer:

Question 5.

Modeling Real Life You collect 12 leaves. Your friend collects 26 more than you. How many leaves does your friend collect?

____________ leaves

Answer: 38 leaves

Explanation:

I collect 12 leaves and my friend collect 26 more than me

total leaves my friend had is

12 + 26 = 38 leaves.

**Review & Refresh**

Question 6.

Circle the measurable attributes of the table.

Answer: length or height.

Explanation:

For table length or height is the measuring attribute

cubes represents to measure the length and height.

### Lesson 9.6 Problem Solving: Addition

**Explore and Grow**

Model the story.

Newton has 15 dog bones. Descartes gives him 8 more. How many dog bones does Newton have now?

Answer: 23 bones

Explanation:

Newton has 15 bones and Descartes gave him 8 more

The total bones newton had is 23 bones.

**Show and Grow**

Question 1.

You have 49 toy soldiers. You buy some more. Now you have 84. How many toy soldiers did you buy?

Circle what you know:

Underline what you need to find.

Solve:

_____________ toy soldiers

Answer: 35 toy soldiers

Explanation:

I have 49 toy soldiers

If i buy 35 more

Then i will have 84 in total.

**Apply and Grow: Practice**

Question 2.

You have 55 pounds of dog food and some cat food. You have 63 pounds of pet food in all. How many pounds of cat food do you have?

Circle what you know.

Underline what you need to find.

Solve:

___________ pounds

Answer: 8 pounds

Explanation:

I have 55 pound of dog food

If i had 8 pounds of cat food

In total the pet food had is 63 pounds

Question 3.

A teacher has 34 erasers. There are 46 fewer erasers than pencils. How many pencils are there?

____________ pencils

Answer:

Question 4.

**DIG DEEPER!**

You have 25 toys. Your friend has more than you. There are more than 60 toys in all. How many toys can your friend have?

29 33 24 38

Answer: 35 toys

Explanation:

I have 25 toys

and if had 35 then the total toys will be 60

according to the given options it might be less than 35

29, 33 or 24

**Think and Grow: Modeling Real Life**

You need 60 invitations. You have 36 and buy 36 more. Do you have enough invitations?

Circle what you know.

Underline what you need to find.

Solve:

Compare: ___________ ○ 60 Yes No

Answer: yes

Explanation:

66 > 60

I had 6 more invitations

Yes they have enough invitations.

**Show and Grow**

Question 5.

You need 84 bottles of water. You have 48 and buy 32 more. Do you have enough bottles of water?

Circle what you know.

Underline what you need to find.

Solve:

Compare: ___________ ○ 84 Yes No

Answer: No

Explanation:

The water bottles I had 80

The water bottles needed is 84

80 < 84

so, there are no enough waterbottles

### Problem Solving: Addition Practice 9.6

Question 1.

You have 31 stuffed animals. You and your friend have 60 stuffed animals in all. How many stuffed animals does your friend have?

______________ stuffed animals

Answer: 29

Explanation:

31 + 29 = 60,

There are 29 stuffed animals with my friend.

Question 2.

A store has 56 shirts. There are 28 fewer shirts than pairs of pants. How many pairs of pants are there?

______________ Pairs of pants

Answer: 28

Explanation:

Total shirts is 56 and 56 – 28 = 28,

The pairs of paints are 28.

28 + 28 = 56.

Question 3.

**YOU BE THE TEACHER**

You have 25 movies. You have 18 more video games than movies. Your friend says you have (43 movies and video games in all. Is your friend correct? Explain.

___________________________________________________

___________________________________________________

Answer: 43:

Explanation

Me having 25 movies and 18 videogames 25 + 18 = 43,

Yes my friend is correct I have 43 movies and videogames in all.

Question 4.

**Modeling Real Life**

Newton needs 9o chairs for a party. He has 51. He rents 3 more. Does Newton have enough chairs?

Circle: Yes No

Answer: No,

Explanation:

Newton doesn’t have enough chairs.

He needed is 90 he has 51 + 3 = 54.

**Review & Refresh**

Circle the longer object.

Question 5.

Answer:

The scissor is longer than the brick

circled the scissor

Question 6.

Answer:

The first pencil is longer than the second pencil

First pencil is circled

### Add Two-Digit Numbers Performance Task

Question 1.

You play a game. Each red ball you collect is worth 10 points. Each yellow ball you collect is worth 1 point.

a. You collect 3 red balls and 13 yellow balls. How many points do you have?

___________ points

Answer: 30

Explanation

Red ball = 10

yellow = 1.

I have collected 3 red and 13 yellow,

3 × 10 = 30

39 + 13 = 52. Total points are 52.

b. Your teammates score 38 points and 24 points. How many points do your teammates have in all?

___________ points

Answer:

38 + 24 = 62,

62 points our teammates have in all.

c. Your learn wants to have 100 points. Does your team reach its goal?

Yes No

Answer: No,

we didn’t reach the goal.

d. Why do you think a red ball is worth more points?

Answer:

Because it is small in size and easy to handle to kids by seeing in the figure.

### Add Two-Digit Numbers Change Practice

### Add Tens and Ones Homework & Practice 9.1

Question 1.

56 + 3 = _________

Answer:

53 + 3 = 56,

5 tens and 6 ones.

Question 2.

22 + 54 = __________

Answer:

24 + 54 = 78,

7 tens and 8 ones.

### Add Tens and Ones Using a Number Line Homework & Practice 9.2

Question 3.

62 + 25 = ___________

Answer: 62 + 25 = 87

Explanation:

6 tens and 2 ones

2 tens and 5 ones

by adding both we get 87

Question 4.

38 + 51 = ___________

Answer: 38 + 51 = 89

Explanation:

3 tens and 8 ones

5 tens and 1 ones

by adding both we get 89.

Question 5.

**MP Structure**

Write an equation that matches the number line.

Answer: 16 + 52 = 68

### Make a 10 to Add Homework & Practice 9.3

Question 6.

42 + 6 = ___________

Make a 10? Yes No

Answer: No

Explanation:

lines represents the tens and circles represents the ones

4 tens and 2 ones

0 tens and 6 ones

By adding ones place from both the sides 2 + 6 = 8

so there is no 10 in it.

Question 7.

27 + 7 = ___________

Make a 10? Yes No

Answer: yes

Explanation:

lines represents the tens and circles represents the ones

2 tens and 7 ones

0 tens and 7 ones

By adding ones place from both the sides 7 + 7 = 14

so there is 10 in it

**MP Logic**

Complete.

Question 8.

Answer:

34 + 7 = 41.

Question 9.

Answer:

59 + 8 = 67

### Add Two-Digit Numbers Homework & Practice 9.4

Make quick sketches to find the sum.

Question 10.

Answer:

28 + 33 = 61, 6 tens and 1 ones.

Question 11.

____________ tens ___________ one

Answer:

49 + 24 =73, 7 tens and 3 ones.

Question 12.

**Modeling Real Life**

Your club earns a badge for every 10 trees planted. Your club plants 25 trees in the fall and 25 in the spring. How many badges does your club earn?

_______________ badges

Answer:

One badge for 10, 25 in spring and 25 in fall.

Total trees planted is 25 + 25 = 50.

So, 5 badges.

### Practice Addition Strategies Homework & Practice 9.5

Question 13.

19 + 43 = __________

Answer: 19 + 43 = 62, 6 tens and 2 ones.

Question 14.

66 + 28 = __________

Answer: 66 + 28 = 94, 9 tens and 4 ones.

### Problem Solving: Addition Homework & Practice 9.6

Question 15.

Your friend has 5 marbles. You have 23 more than your friend. How many marbles do you have?

_______________ marbles

Answer: 28 marbles

Explanation

My friend has 5 and me having 23 more

than my friend 23 + 5 = 28.

Question 16.

**Modeling Real Life**

You need 50 party hats. You have 24. You buy 16 more. Do you have enough party hats?

Yes No

Answer: No

Explanation:

Me having 24 caps and bought 16 more

24 + 16 = 40,

No, I don’t have enough caps.

*Conclusion:*

Download Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers pdf and start your preparation for the exams. Big Ideas Math Answer is the best platform for the students to improve their math skills. If you have any queries about Big Ideas Math Answers Grade 1 Chapters you can post the comments in the below comment box. All the Best!!