Worksheet: Relating Addition to Subtraction: Numbers up to 20

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In this worksheet, we will practice writing a family of addition and subtraction facts linking three numbers up to 20.

Q1:

We know that 8 plus 7 is 15. Here are the four number sentences for 8, 7, and 15. 8+7=1515−7=87+8=1515−8=7

Here are some number sentences for 5, 6, and 11. 6+5=1111−5=65+6=11 Which number sentence for 5, 6, and 11, is missing?

  • A 1 1 − 6 = 5
  • B 1 1 − 5 = 6
  • C 1 1 − 6 = 6
  • D 6 − 5 = 1 1
  • E 5 + 6 = 1 1

Q2:

Which number sentence is wrong?

  • A 1 2 + 4 = 8
  • B 4 + 8 = 1 2
  • C 1 2 − 8 = 4
  • D 8 + 4 = 1 2
  • E 1 2 − 4 = 8

Q3:

16 plus 3 is 19. Which number sentence is missing from the number sentences 3+16=19,16+3=19,19−16=3?

  • A 1 9 − 3 = 1 4
  • B 1 6 + 3 = 1 9
  • C 1 9 − 3 = 1 6
  • D 1 6 − 3 = 1 3
  • E 1 9 − 1 6 = 3

Q4:

Use 6+13=19 to fill in the blanks in these number sentences.

1 3 + = 1 9

1 9 − 6 =

− 1 3 = 6

Q5:

We know that 7+3=10.

What other facts do we know? Find the missing numbers.

Q6:

The picture shows that: 17−9=8.

Use the picture to complete the addition sentence: 9+8=.

Q7:

We know that 12+7=19. Use the picture to check this if you need to.

Use this addition fact to find the missing number in the subtraction sentence 19−7=.

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