## Engage NY Eureka Math 4th Grade Module 7 Lesson 9 Answer Key

### Eureka Math Grade 4 Module 7 Lesson 9 Problem Set Answer Key

Question 1.

Determine the following sums and differences. Show your work.

a. 23 min + 37 min = _______ hr

b. 1 hr 11 min + 49 min = _______ hr

c. 1 hr – 12 min = _______ min

d. 4 hr – 12 min = _______ hr _______ min

e. 22 sec + 38 sec = _______ min

f. 3 min – 45 sec = _______ min _______ sec

Answer:

a. 23 min + 37 min = 1 hr

b. 1 hr 11 min + 49 min = 2 hr

c. 1 hr – 12 min = 48 min

d. 4 hr – 12 min = 3 hr 48 min

e. 22 sec + 38 sec = 1 min

f. 3 min – 45 sec = 2 min 15 sec

Question 2.

Find the following sums and differences. Show your work.

a. 3 hr 45 min + 25 min = _____ hr _____ min

b. 2 hr 45 min + 6 hr 25 min = _____ hr _____ min

c. 3 hr 7 min – 42 min = _____ hr _____ min

d. 5 hr 7 min – 2 hr 13 min = _____ hr _____ min

e. 5 min 40 sec + 27 sec = ______ min _____ sec

f. 22 min 48 sec – 5 min 58 sec = ________ min ____ sec

Answer:

a. 3 hr 45 min + 25 min = 4 hr 10 min

b. 2 hr 45 min + 6 hr 25 min = 9 hr 10 min

c. 3 hr 7 min – 42 min = 2 hr 25 min

d. 5 hr 7 min – 2 hr 13 min = 2 hr 54 min

e. 5 min 40 sec + 27 sec = 6 min 7 sec

f. 22 min 48 sec – 5 min 58 sec = 16 min 50 sec

Question 3.

At the cup-stacking competition, the first place finishing time was 1 minute 52 seconds. That was 31 seconds faster than the second place finisher. What was the second place time?

Answer:

Given that,

The first place finishing time = 1 minute 52 seconds

Also given, The first place finishing time is 31 seconds faster than second place finisher

Now,

1 minute 52 seconds + 31 seconds = 2 minutes 23 seconds

Therefore, the second place time is 2 minutes 23 seconds.

Question 4.

Jackeline and Raychel have 5 hours to watch three movies that last 1 hour 22 minutes, 2 hours 12 minutes, and 1 hour 57 minutes, respectively.

a. Do the girls have enough time to watch all three movies? Explain why or why not.

b. If Jackeline and Raychel decide to watch only the two longest movies and take a 30-minute break in between, how much of their 5 hours will they have left over?

Answer:

a.

Given that, the total time = 5 hours

The time required to watch three movies respectively, :

1 hour 22 minutes + 2 hours 12 minutes + 1 hour 57 minutes

= 5 hours 31 minutes

Therefore, they do not have enough time to watch all the three movies.

They need 31 minutes more to complete all movies.

b.

The time required to watch long movies with 30 minutes break in between =

2 hours 12 minutes + 1 hour 57 minutes + 30 minutes

= 4 hours 39 minutes

Now,

5 hours – 4 hours 39 minutes

= 21 minutes

They will have 21 minutes left over.

### Eureka Math Grade 4 Module 7 Lesson 9 Exit Ticket Answer Key

Find the following sums and differences. Show your work.

Question 1.

2 hr 25 min + 25 min = ______ hr ______ min

Answer:

2 hr 25 min + 25 min = 2 hr 50 min

Question 2.

4 hr 45 min + 2 hr 35 min = ______ hr _____ min

Answer:

4 hr 45 min + 2 hr 35 min = 7 hr 20 min

Question 3.

11 hr 6 min – 32 min = _______ hr _______ min

Answer:

11 hr 6 min – 32 min = 10 hr 34 min

Question 4.

8 hr 9 min – 6 hr 42 min = ______ hr_____ min

Answer:

8 hr 9 min – 6 hr 42 min = 1 hr 27 min

### Eureka Math Grade 4 Module 7 Lesson 9 Homework Answer Key

Question 1.

Determine the following sums and differences. Show your work.

a. 41 min + 19 min = _______ hr

b. 2 hr 21 min + 39 min = _______ hr

c. 1 hr – 33 min = _______ min

d. 3 hr – 33 min = _______ hr _______ min

e. 31 sec + 29 sec = _______ min

f. 5 min – 15 sec = _______ min ________ sec

Answer:

a. 41 min + 19 min = 1 hr

b. 2 hr 21 min + 39 min = 3 hr

c. 1 hr – 33 min = 27 min

d. 3 hr – 33 min = 2 hr 27 min

e. 31 sec + 29 sec = 1 min

f. 5 min – 15 sec = 4 min 45 sec

Question 2.

Find the following sums and differences. Show your work.

a. 5 hr 30 min + 35 min = ______ hr ______ min

b. 3 hr 15 min + 5 hr 55 min = ______ hr_____ min

c. 4 hr 4 min – 38 min = _______ hr ______ min

d. 7 hr 3 min – 4 hr 25 min = ______ hr _____ min

e. 3 min 20 sec + 49 sec = ______ min ______ sec

f. 22 min 37 sec – 5 min 58 sec = ____ min ____ sec

Answer:

a. 5 hr 30 min + 35 min = 6 hr 5 min

b. 3 hr 15 min + 5 hr 55 min = 9 hr 10 min

c. 4 hr 4 min – 38 min = 3 hr 26 min

d. 7 hr 3 min – 4 hr 25 min = 2 hr 38 min

e. 3 min 20 sec + 49 sec = 4 min 9 sec

f. 22 min 37 sec – 5 min 58 sec = 16 min 39 sec

Question 3.

It took 5 minutes 34 seconds for Melissa’s oven to preheat to 350 degrees. That was 27 seconds slower than it took Ryan’s oven to preheat to the same temperature. How long did it take Ryan’s oven to preheat?

Answer:

Given that, the time taken for Melissa to preheat to 350 degrees = 5 minutes 34 seconds

Also given,

The time is 27 seconds slower than Ryan’s oven to preheat the same temperature.

Now, 5 minutes 34 seconds – 27 seconds

= 5 minutes 7 seconds

Therefore, Ryan took 5 minutes 7 seconds to preheat the oven

Question 4.

Joanna read three books. Her goal was to finish all three books in a total of 7 hours. She completed them, respectively, in 2 hours 37 minutes, 3 hours 9 minutes, and 1 hour 51 minutes.

a. Did Joanna meet her goal? Write a statement to explain why or why not.

b. Joanna completed the two shortest books in one evening. How long did she spend reading that evening? How long, with her goal in mind, did that leave her to read the third book?

Answer:

The total time to finish three books according to Joanna’s goal = 7 hours

The total she completed reading :

2 hours 37 minutes + 3 hours 9 minutes + 1 hour 51 minutes

= 7 hours 37 minutes

So, She did not reach her goal

She took 37 minutes more than her goal.

b.

The time required to read shortest book =

2 hours 37 min + 1 hour 51 minutes = 4 hours 28 minutes

Now,

7 hours – 4 hours 28 minutes = 2 hours 32 minutes

Therefore, Joanna is left with 2 hours 32 minutes to complete the third book.