# Bridges in Mathematics Grade 3 Student Book Unit 3 Module 2 Answer Key

The solutions to Bridges in Mathematics Grade 3 Student Book Answer Key Unit 3 Module 2 can help students to clear their doubts quickly.

## Bridges in Mathematics Grade 3 Student Book Answer Key Unit 3 Module 2

Bridges in Mathematics Grade 3 Student Book Unit 3 Module 2 Session 1 Answer Key

Strategy Match 4

Question 1.
Three students solved a problem using the different strategies shown below.

• Fill in the blanks for each strategy.
• Match the studentsâ€™ work below to the strategies in the table.

Number of Points Molly Scored = 82
Number of Points Sue Scored = 47
Strategy A
Take Away to a friendly number, then take away a friendly number and adjust
= (77-47)+(80-77)+(82-80)
= 30+3+2
= 35
Strategy B
Take Away a friendly number and adjust
= 82-35
= 47
Strategy C
Difference Between Numbers
Number of Points Molly has than Sue = 82 – 47
= 35

Question 2.
Use the number line below to subtract 76 – 39.

Given 76 and 39 are two numbers.
When 39 is subtracted from 76 it generates the value 37 on the number line as shown below.

Strategy Match 5

Three students solved problems 91 – 57. All the students used a number line, but each student solved the problem differently. Match the studentsâ€™ work below to the strategies in the table.

Question 1.

Strategy A: Remove(Take Away) 57 from 91
= 91 – 57
= 34

Question 2.

Strategy B: Find the distance between numbers
= (60-57)+(90-60)+(91-90)
= 3+30+1
= 34

Question 3.

Strategy C
Constant Difference – shift the numbers along the line by the same distance
= (91+3)-(57+3)
= 94-60
= 34

Bridges in Mathematics Grade 3 Student Book Unit 3 Module 2 Session 3 Answer Key

Strategy Match 6

Three students solved the problem 71 – 38. All the students used a number line, but each student solved the problem differently.

• Fill in the blanks for each strategy.
• Match the studentsâ€™ work below to the strategies in the table.

Question 1.

Distance between 33 and 71
= (71-41)+(41-40)+(40-33)
= 30+1+7
=38

Question 2.

Subtract 38 from 71
= 71-38
= 33

Question 3.

Add 2 to each number to make the sum simple
38+2 = 40, 71+2 = 73
71-38=73-40 = 33

Bridges in Mathematics Grade 3 Student Book Unit 3 Module 2 Session 4 Answer Key

Strategy Match 7

Three students solved problems 185 – 148. All the students used a number line, but each student solved the problem differently.

• Fill in the blanks for each strategy.
• Match the studentsâ€™ work below to the strategies in the table.

Question 1.

Strategy: (184-100)+(85-40)+(45-8)
= 84+45+37
=148

Question 2.

Question 3.

Remove 148 from 185 i.e. 185-148 = 37

Bridges in Mathematics Grade 3 Student Book Unit 3 Module 2 Session 5 Answer Key

Using the Number Line to Find Differences

Use the number lines to solve each problem below.

ex Veronica has $76. She wants to buy a bike that costs$162. How much more money does she need?

She needs \$86 more.

Question 1.
Clive and his family are driving to the beach. They will drive 136 miles total. So far, they have driven 84 miles. How much farther do they have to go? Show your work. Write your answer in the space below.
They have ___ more miles to go.
The number of miles Clive and his family is driving to the beach in total is 136 miles
The distance they drove so far was 84 miles
The distance they need to go = total distance to the beach – the distance they drove
= 136-84
= 52
Therefore, they need to drive 52 more miles to reach the beach.

Question 2.
Shanice is reading a book that is 143 pages long. So far, she has read 56 pages. How many more pages does she have to read? Show your work. Write your answer in the space below.

she has ___ pages left to read.