## Engage NY Eureka Math 4th Grade Module 7 Lesson 8 Answer Key

### Eureka Math Grade 4 Module 7 Lesson 8 Problem Set Answer Key

Question 1.

Determine the following sums and differences. Show your work.

a. 7 oz + 9 oz = ________ lb

b. 1 lb 5 oz + 11 oz = ________ lb

c. 1 lb – 13 oz = ________ oz

d. 12 lb – 4 oz = ________ lb ________ oz

e. 3 lb 9 oz + 9 oz = ________ lb ________ oz

f. 30 lb 9 oz + 9 lb 9 oz = ________ lb ________ oz

g. 25 lb 2 oz – 14 oz = ________ lb ________ oz

h. 125 lb 2 oz – 12 lb 3 oz = ________ lb ________ oz

Answer:

a. 7 oz + 9 oz = 1 lb

b. 1 lb 5 oz + 11 oz = 2 lb

c. 1 lb – 13 oz = 3 oz

d. 12 lb – 4 oz = 11 lb 12 oz

e. 3 lb 9 oz + 9 oz = 4 lb 2 oz

f. 30 lb 9 oz + 9 lb 9 oz = 40 lb 2 oz

g. 25 lb 2 oz – 14 oz = 24 lb 4 oz

h. 125 lb 2 oz – 12 lb 3 oz = 112 lb 15 oz

Question 2.

The total weight of Sarah and Amanda’s full backpacks is 27 pounds. Sarah’s backpack weighs 15 pounds 9 ounces. How much does Amanda’s backpack weigh?

Answer:

Given that, the weight of the both backpacks = 27 pounds

Also given, the weight of Sarah’s bag = 15 pounds 9 ounces

Now,

27 – 15 lb 9 oz = 11 lb 7 oz

Therefore, the weight of Amanda’s backpack = 11 pounds 7 ounces

Question 3.

In Emma’s supply box, a pencil weighs 3 ounces. Her scissors weigh 3 ounces more than the pencil, and a bottle of glue weighs three times as much as the scissors. How much does the bottle of glue weigh in pounds and ounces?

Answer:

Given that,

The weight of pencil = 3 ounces

Also given the weight of scissors is 3 ounces more than the pencil

= 3 oz x 6

= 18 oz

1 pound = 16 ounces

So, 1 pound 2 ounces

Therefore, the bottle of glue weighs 1 pound 2 ounces.

Question 4.

Use the information in the chart about Jodi’s school supplies to answer the following questions:

a. On Mondays, Jodi packs only her laptop and supply case into her backpack. How much does her full backpack weigh?

b. On Tuesdays, Jodi brings her laptop, supply case, two notebooks, and two textbooks in her backpack. On Fridays, Jodi only packs her binder and supply case. How much less does Jodi’s full backpack weigh on Friday than it does on Tuesday?

Answer:

a. The weight of backpack = 2 lb 14 oz

The weight of laptop = 5 lb 12 oz

The weight of supply case = 1 lb

Total weight = 2 lb 14 oz + 5 lb 12 oz + 1 lb

= 8 lb 26 oz

It is also written as 9 pounds 10 ounces

Therefore, the weight of Emma’s backpack = 9 pounds 10 ounces.

b. On Tuesdays :

The weight of laptop, supply case, two notebooks, and two textbooks

5 lb 12 oz + 1 lb + 11 lb + 11 lb + 3 lb 8 oz + 3 lb 8 oz = 12 lb 50 oz

It is also written as 15 lb 2 oz.

On Fridays ;

Binder and supply case

2 lb 5 oz + 1 lb = 3 lb 5 oz

Now,

15 lb 2 oz – 3 lb 5 oz =

11 lb 13 oz

Therefore, Jodi’s backpack weight is 11 pounds 13 ounces less on Friday than on Tuesdays

### Eureka Math Grade 4 Module 7 Lesson 8 Exit Ticket Answer Key

Determine the following sums and differences. Show your work.

Question 1.

4 lb 6 oz + 10 oz = ________ lb ________ oz

Answer: 4 lb 6 oz + 10 oz = 5 lb 0 oz

Question 2.

12 lb 4 oz + 3 lb 14 oz = ________ lb ________ oz

Answer: 12 lb 4 oz + 3 lb 14 oz = 16 lb 2 oz

Question 3.

5 lb 4 oz – 12 oz = ________ lb ________ oz

Answer: 5 lb 4 oz – 12 oz = 4 lb 8 oz

Question 4.

20 lb 5 oz – 13 lb 7 oz = ________ lb ________oz

Answer: 20 lb 5 oz – 13 lb 7 oz = 6 lb 14 oz

### Eureka Math Grade 4 Module 7 Lesson 8 Homework Answer Key

Question 1.

Determine the following sums and differences. Show your work.

a. 11 oz + 5 oz = ________ lb

b. 1 lb 7 oz + 9 oz = ________lb

c. 1 lb – 11 oz = ________ oz

d. 12 lb – 8 oz = ________ lb ________ oz

e. 5 lb 8 oz + 9 oz = ________ lb ________ oz

f. 21 lb 8 oz + 6 lb 9 oz = ________ lb ________ oz

g. 23 lb 1 oz – 15 oz = ________ lb ________ oz

h. 89 lb 2 oz – 16 lb 4 oz = ________ lb ________ oz

Answer:

a. 11 oz + 5 oz = 1 lb

b. 1 lb 7 oz + 9 oz = 2 lb

c. 1 lb – 11 oz = 5 oz

d. 12 lb – 8 oz = 11 lb 8 oz

e. 5 lb 8 oz + 9 oz = 6 lb 1 oz

f. 21 lb 8 oz + 6 lb 9 oz = 28 lb 1 oz

g. 23 lb 1 oz – 15 oz = 22 lb 2 oz

h. 89 lb 2 oz – 16 lb 4 oz = 72 lb 14 oz

Question 2.

When David took his dog, Rocky, to the vet in December, Rocky weighed 29 pounds 9 ounces. When he took Rocky back to the vet in March, Rocky weighed 34 pounds 4 ounces. How much weight did Rocky gain?

Answer:

The weight of David’s dog Rocky in December = 29 pounds 9 ounces

The weight of dog in March = 34 pounds 4 ounces

It is also written as 33 pounds 20 ounces

Now,

33 pounds 20 ounces – 29 pounds 9 ounces

= 4 pounds 11 ounces

Therefore, Rocky gained : 4 pounds 11 ounces.

Question 3.

Bianca had 6 identical jars of bubble bath. She put them all in a bag that weighed 2 ounces. The total weight of the bag filled with the six jars was 1 pound 4 ounces. How much did each jar weigh?

Answer:

1 pound 4 oz = 20 oz

The weight of bag = 2 oz

Now, 20 oz – 2 oz = 18 oz

18 / 6 = 3

Therefore, Each jar weighs 3 ounces.

Question 4.

Use the information in the chart about Melissa’s school supplies to answer the following questions:

a. On Wednesdays, Melissa packs only two notebooks and a binder into her backpack. How much does her full backpack weigh on Wednesdays?

b. On Thursdays, Melissa puts her laptop, supply case, two textbooks, and a notebook in her backpack. How much does her full backpack weigh on Thursdays?

c. How much more does the backpack weigh with 3 textbooks and a notebook than it does with just 1 textbook and the supply case?

Answer:

a. On Wednesdays,

The weight of two notebooks and a binder in backpack :

11 oz +11 oz +2 lb 5 oz + 2 lb 14 oz = 4 lb 41 oz

It is also written as 6 lb 9 oz

Therefore, the weight of backpack on Wednesdays = 6 pounds and 9 ounces.

b. On Thursdays,

The weight of laptop, supply case, Two textbooks and a note book in her backpack :

5 lb 12 oz + 1 lb + 3 lb 8 oz + 3 lb 8 oz + 11 oz + 2 lb 14 oz

= 17 lb 5 oz

Therefore, the weight of backpack on Wednesdays = 17 lb 5 oz

c. The weight of three textbooks and a notebook =

3 lb 8 oz + 3 lb 8 oz + 3 lb + 8 oz + 11 oz = 11 lb 3 oz

The weight of 1 textbook and supply case =

3 lb 8 oz + 1 lb = 4 lb 8 oz

Now , 11 oz 3 oz – 4 lb 8 oz = 6 lb 11 oz

Therefore, the bag weighs 6 lb 11 oz more.