Practice with the help of **Spectrum Math Grade 1 Answer Key Chapter 3 Lesson 3.13**** Using Addition for Subtraction** regularly and improve your accuracy in solving questions.

## Spectrum Math Grade 1 Chapter 3 Lesson 3.13 Using Addition for Subtraction Answers Key

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

Answer:

When three is subtracted from seventeen it gives the value 14 as shown below.

i.e. 17 -3 = 14

Answer:

Let the unknown number be x

3 + x = 17

x = 17 – 3

x = 14

Therefore 3 +14 is equal to 17.

Answer:

When five are subtracted from twenty it gives the value 15 as shown below.

i.e. 20 – 5 = 15

Answer:

Let the unknown number be x

5 + x = 20

x = 20 – 5

x = 15

Therefore 5 +15 is equal to 20 .

Answer:

When 5 are subtracted from Nineteen it gives the value 14 as shown below.

i.e. 19 – 5 = 14

Answer:

Let the unknown number be x

5 + x = 19

x = 19 – 5

x = 14

Therefore 5 +14 is equal to 19 .

Answer:

When 1 is subtracted from Eighteen it gives the value 17 as shown below.

i.e. 18 – 1 = 17

Answer:

Let the unknown number be x

1 + x = 18

x = 18 – 1

x = 17

Therefore 1 +17 is equal to 18 .

Answer:

When 4 are subtracted from Four it gives the value 11 as shown below.

i.e. 15 – 4 = 11

Answer:

Let the unknown number be x

4 + x = 15

x = 15 – 4

x = 11

Therefore 4 +11 is equal to 15.

Answer:

When 2 are subtracted from Fourteen it gives the value 12 as shown below.

i.e. 14 – 2 = 12

Answer:

Let the unknown number be x

2 + x = 14

x = 14 – 2

x = 12

Therefore 2 +x is equal to 14.

Answer:

When 1 is subtracted from Sixteen it gives the value 15 as shown below.

i.e. 16 – 1 = 15

Answer:

Let the unknown number be x

1 + x = 16

x = 16 – 1

x = 15

Therefore 1 + 15 is equal to 16.

Answer:

When 6 are subtracted from Twenty it gives the value 14 as shown below.

i.e. 20 – 6 = 14

Answer:

Let the unknown number be x

6 + x = 20

x = 20 – 6

x = 14

Therefore 6 + 14 is equal to 20.

Answer:

When 0 is subtracted from Thirteen it gives the value 13 as shown below.

i.e. 13 – 0 = 13

Answer:

Let the unknown number be x

0 + x = 13

x = 13 – 0

x = 13

Therefore 0 + 13 is equal to 13.