## Engage NY Eureka Math 3rd Grade Module 7 Lesson 3 Answer Key

Eureka Math Grade 3 Module 7 Answer Key

### Eureka Math Grade 3 Module 7 Lesson 3 Pattern Sheet Answer Key

Multiply.

multiply by 4 (1–5)

Explanation:
4 × 1 = 4
4 × 2 = 8
4 × 3 = 12
4 × 4 = 16
4 × 5 = 20

### Eureka Math Grade 3 Module 7 Lesson3 Problem Set Answer Key

Use the RDW process to solve the problems below. Use a letter to represent the unknown in each problem. When you are finished, share your solutions with a partner. Discuss and compare your strategies with your partner’s strategies.

Question 1.
Monica measures 91 milliliters of water into 9 tiny beakers. She measures an equal amount of water into the first 8 beakers. She pours the remaining water into the ninth beaker. It measures 19 milliliters. How many milliliters of water are in each of the first 8 beakers?

Amount of water Monica pours into each of the first 8 beakers = 9 milliliters.

Explanation:
Amount of water Monica measures into 9 tiny beakers = 91 milliliters
Amount of water in ninth beaker = 19 milliliters
Amount of water Monica measures into 8 tiny beakers = Amount of water Monica measures into 9 tiny beakers – Amount of water in ninth beaker
= 91 – 19
= 72 milliliters.
Amount of water Monica pours into each of the first 8 beakers = Amount of water Monica measures into 8 tiny beakers  ÷ 8
= 72 ÷ 8
= 9 milliliters.

Question 2.
Matthew and his dad put up 8 six-foot lengths of fence on Monday and 9 six-foot lengths on Tuesday. What is the total length of the fence?

Total Length of the six-foot fence Matthew and his dad put up on Monday and Tuesday = 17.

Explanation:
Length of the six-foot fence Matthew and his dad put up on Monday = 8
Length of the six-foot fence Matthew and his dad put up on Tuesday = 9
Total Length of the six-foot fence Matthew and his dad put up on Monday and Tuesday = Length of the six-foot fence Matthew and his dad put up on Monday + Length of the six-foot fence Matthew and his dad put up on Tuesday
= 8 + 9
= 17.

Question 3.
The total weight of Laura’s new pencils is 112 grams. One pencil rolls off the scale. Now the scale reads 105 grams. What is the total weight of 7 new pencils?

Total weight of 7 new pencils = 98 grams.

Explanation:
Total weight of Laura’s new pencils = 112 grams
Weight of the pencils scale reads now = 105 grams
Weight of One pencil rolls off the scale = Total weight of Laura’s new pencils – Weight of the pencils scale reads now
= 112 – 105
= 7 grams.
Total weight of 7 new pencils = Weight of the pencils scale reads now – Weight of One pencil rolls off the scale
= 105 – 7
= 98 grams.

Question 4.
Mrs. Ford’s math class starts at 8:15. They do 3 fluency activities that each last 4 minutes. Just when they finish all of the fluency activities, the fire alarm goes off. When they return to the room after the drill, it is 8:46. How many minutes did the fire drill last?

Time taken for the fire drill last = 19 minutes.

Explanation:
Time of the Mrs. Ford’s math class starts = 8:15.
Time of the Mrs. Ford’s returning to the room after the drill = 8:46
They do 3 fluency activities that each last 4 minutes.
=> Time taken for 3 fluency activities = 4 × 3 = 12 minutes.
Time taken for the Mrs. Ford’s math class to end = Time of the Mrs. Ford’s math class starts + Time taken for 3 fluency activities
= 8:15 + 0:12
= 8:27.
Time taken for the fire drill last = Time of the Mrs. Ford’s returning to the room after the drill  – Time taken for the Mrs. Ford’s math class to end
= 8:46 -8:27
= 19 minutes.

Question 5.
On Saturday, the baker bought a total of 150 pounds of flour in five-pound bags. By Tuesday, he had 115 pounds of flour left. How many five-pound bags of flour did the baker use?

Amount of five-pound bags of flour used by the baker = 35 pounds.

Explanation:
Amount of total flour bought on Saturday in five-pound bags = 150 pounds.
Amount of flour left by Tuesday = 115 pounds
Amount of five-pound bags of flour used by the baker = Amount of total flour bought on Saturday in five-pound bags  – Amount of flour left by Tuesday
= 150 – 115
= 35 pounds.

Question 6.
Fred cut an 84-centimeter rope into 2 parts and gave his sister 1 part. Fred’s part is 56 centimeters long. His sister cut her rope into 4 equal pieces. How long is 1 of his sister’s pieces of rope?

Length of each piece of rope Fred’s sister makes = 7 centimeters.

Explanation:
Total length of the Fred rope had= 84 centimeter
Length of Fred’s rope part= 56 centimeters
Length of Fred’s sister part rope = Total length of the Fred rope had – Length of Fred’s rope part
= 84 – 56
= 28.
His sister cut her rope into 4 equal pieces.
=> Number of pieces of rope Fred’s sister makes = 4
=> Length of each piece of rope Fred’s sister makes = Length of Fred’s sister part rope  ÷ Number of pieces of rope Fred’s sister makes
= 28 ÷ 4
= 7 centimeters.

### Eureka Math Grade 3 Module 7 Lesson 3 Exit Ticket Answer Key

Use the RDW process to solve the problem below. Use a letter to represent the unknown.
Twenty packs of fruit snacks come in a box. Each pack weighs 6 ounces. Students eat some. There are 48 ounces of fruit snacks left in the box. How many ounces of fruit snacks did the students eat?

Weight of packs of fruit snacks students ate = 72 ounces.

Explanation:
Weight of each pack = 6 ounces.
Number of fruit snacks come in a box = 20
Weight of 20 pack of fruit snacks = 20 × 6 = 120 ounces.
Weight of packs of fruit snacks left over in the box = 48 ounces
Weight of packs of fruit snacks students ate = Weight of 20 pack of fruit snacks + Weight of packs of fruit snacks left over in the box
= 120 – 48
= 72 ounces.

### Eureka Math Grade 3 Module 7 Lesson 3 Homework Answer Key

Use the RDW process to solve the problems below. Use a letter to represent the unknown in each problem.
Question 1.
Jerry pours 86 milliliters of water into 8 tiny beakers. He measures an equal amount of water into the first 7 beakers. He pours the remaining water into the eighth beaker. It measures 16 milliliters. How many milliliters of water are in each of the first 7 beakers?

Amount of water he pours equally into the each first seven beakers = 10 milliliters.

Explanation:
Amount of water Jerry pours into 8 tiny beakers = 86 milliliters
Amount of water he pours into the eighth beaker = 16 milliliters
Amount of water he pours  into the first seven beakers = Amount of water Jerry pours into 8 tiny beakers  – Amount of water he pours into the eighth beaker
= 86 – 16
= 70 milliliters.
Number of first beakers = 7
Amount of water he pours equally into the each first seven beakers = Amount of water he pours  into the first seven beakers  ÷ Number of beakers
= 70 ÷ 7
= 10 milliliters.

Question 2.
Mr. Chavez’s third graders go to gym class at 11:15. Students rotate through three activities for 8 minutes each. Lunch begins at 12:00. How many minutes are there between the end of gym activities and the beginning of lunch?

Time taken between the end of gym activities and the beginning of lunch = 21 minutes.

Explanation:
Time of Mr. Chavez’s third graders go to gym class = 11:15
Time of they Lunch begins = 12:00
Students rotate through three activities for 8 minutes each.
=> Time taken for three activities = 8 × 3 = 24 minutes.
Time totally taken for the gym activities = Time of Mr. Chavez’s third graders go to gym class + Time taken for three activities
= 11:15 + 24
= 11:39.
Time taken between the end of gym activities and the beginning of lunch =  Time of they Lunch begins  – Time totally taken for the gym activities
=12:00 – 11.39
= 21 minutes.

Question 3.
A box contains 100 pens. In each box there are 38 black pens and 42 blue pens. The rest are green pens. Mr. Cane buys 6 boxes of pens. How many green pens does he have in total?

Number of Green pens Mr. Cane  has = 120.

Explanation:
Number of pens a box contains = 100
Number of Black pens present in each box = 38
Number of Blue pens present in each box = 42
Number of Green pens present in each box = Number of pens a box contains  – ( Number of Black pens present in each + Number of Blue pens present in each box )
= 100 – ( 38 + 42)
= 100 – 80
= 20.
Number of boxes of pens Mr. Cane buys = 6
Number of Green pens Mr. Cane  has = Number of Green pens present in each box  × Number of boxes of pens Mr. Cane buys
= 20 × 6
= 120.

Question 4.
Greg has $56. Tom has$17 more than Greg. Jason has $8 less than Tom. a. How much money does Jason have? b. How much money do the 3 boys have in total? Answer: a. Amount of money Jason has =$65.
b. Total amount of money 3 boys have =  $194. Explanation: Amount of money Greg has =$56
Tom has $17 more than Greg. => Amount of money Tom has = Amount of money Greg has +$17
= $56 +$17
= $73. a) Jason has$8 less than Tom.
=> Amount of money Jason has = Amount of money Tom has  – $8 =$73 – $8 =$65.

b)    Amount of money Greg has = $56 Amount of money Tom has =$73
Amount of money Jason has = $65. Total amount of money 3 boys have = Amount of money Greg has + Amount of money Tom has + Amount of money Jason has =$56 + $73 +$65
= $129 +$ 65
= \$194.

Question 5.
Laura cuts 64 inches of ribbon into two parts and gives her mom one part. Laura’s part is 28 inches long. Her mom cuts her ribbon into 6 equal pieces. How long is one of her mom’s pieces of ribbon?