This handy Math in Focus Grade 1 Workbook Answer Key Chapter 4 Practice 5 Making Fact Families detailed solutions for the textbook questions.

## Math in Focus Grade 1 Chapter 4 Practice 5 Answer Key Making Fact Families

**Write a fact family for each picture.**

Example

Question 1.

Answer:

Explanation:

An addition fact is the sum of two specific addends that will always equal the same result.

A subtraction fact family is a group of related math facts that use the same three numbers. Subtraction fact families also include addition, which is the inverse or opposite operation of subtraction.

Question 2.

Answer:

Explanation:

An addition fact is the sum of two specific addends that will always equal the same result.

A subtraction fact family is a group of related math facts that use the same three numbers. Subtraction fact families also include addition, which is the inverse or opposite operation of subtraction.

**Solve.**

**Use related facts to help you.**

Question 3.

Simone has some tomatoes. She throws away 5 rotten tomatoes. She has 4 tomatoes left. How many tomatoes did she have at first?

___ – 5 = 4

5 + 4 = __ is the related addition fact.

She had _______ tomatoes at first.

Answer:

9 – 5 = 4

5 + 4 = 9 is the related addition fact.

She had 9 tomatoes at first.

Explanation:

An addition fact is the sum of two specific addends that will always equal the same result.

A subtraction fact family is a group of related math facts that use the same three numbers. Subtraction fact families also include addition, which is the inverse or opposite operation of subtraction.

Question 4.

Marcus has 6 magnets. Susan gives him some magnets. Marcus now has 9 magnets. How many magnets did Susan give Marcus?

6 + __ = 9

9 – 6 = ___ is the related subtraction fact.

Susan gave Marcus ___ magnets.

Answer:

6 + 3 = 9

9 – 6 = 3 is the related subtraction fact.

Susan gave Marcus 3 magnets.

Explanation:

An addition fact is the sum of two specific addends that will always equal the same result.

A subtraction fact family is a group of related math facts that use the same three numbers. Subtraction fact families also include addition, which is the inverse or opposite operation of subtraction.

**Find the missing number.**

**Use related facts to help you.**

Question 5.

+ 5 = 10

Answer:

5

Explanation:

5 + 5 = 10

10 – 5 = 5

Used the subtraction fact to find the additional fact

Question 6.

2 + = 7

Answer:

5

Explanation:

7 – 2 = 5

Used the subtraction fact to find the additional fact

Question 7.

– 8 = 2

Answer:

10

Explanation:

2 + 8 = 10

Used the additional fact to find the subtraction fact

Question 8.

9 – = 3

Answer:

6

Explanation:

9 – 3 = 6

Used the subtraction fact to find the subtraction fact