Practice with the help of **Spectrum Math Grade 1 Answer Key Chapter 1 Lesson 1.23**** Using Addition for Subtraction** regularly and improve your accuracy in solving questions.

## Spectrum Math Grade 1 Chapter 1 Lesson 1.23 Using Addition for Subtraction Answers Key

**Think addition for subtraction. Solve each problem.**

**1.**

Answer:

Explanation:

Subtraction:

8 – 4 = 4.

=> Eight minus four equals four.

Addition:

4 + ?? = 8.

=> ?? = 8 – 4

=> ?? = 4.

=> Four plus four equals eight.

**2.**

Answer:

Explanation:

Subtraction:

10 – 3 = 7.

=> Ten minus three equals seven.

Addition:

3 + ?? = 10.

=> ?? = 10 – 3

=> ?? = 7.

=> Three plus seven equals ten.

**3.**

Answer:

Explanation:

Subtraction:

7 – 2 = 5.

=> Seven minus two equals five.

Addition:

2 + ?? = 7.

=> ?? = 7 – 2

=> ?? = 5.

=> Two plus five equals seven.

**4.**

Answer:

Explanation:

Subtraction:

10 – 4 = 6.

=> Ten minus four equals six.

Addition:

4 + ?? = 10.

=> ?? = 10 – 4

=> ?? = 6.

=> Four plus six equals ten.

**5.**

Answer:

Explanation:

Subtraction:

5 – 1 = 4.

=> Five minus one equals four.

Addition:

1 + ?? = 5.

=> ?? = 5 – 1

=> ?? = 4.

=> One plus four equals five.

**6.**

Answer:

Explanation:

Subtraction:

8 – 2 = 6.

=> Eight minus two equals six.

Addition:

2 + ?? = 8.

=> ?? = 8 – 2

=> ?? = 6.

=> Two plus six equals eight.

**7.**

Answer:

Explanation:

Subtraction:

9 – 7 = 2.

=> Nine minus seven equals two.

Addition:

7 + ?? = 9.

=> ?? = 9 – 7

=> ?? = 2.

=> Seven plus two equals nine.

**8.**

Answer:

Explanation:

Subtraction:

7 – 6 = 1.

=> Seven minus six equals one.

Addition:

6 + ?? = 7.

=> ?? = 7 – 6

=> ?? = 1.

=> Six plus one equals seven.

**9.**

Answer:

Explanation:

Subtraction:

8 – 5 = 3.

=> Eight minus five equals three.

Addition:

5 + ?? = 8.

=> ?? = 8 – 5

=> ?? = 3.

=> Five plus three equals eight.