Worksheet: Addition and Subtraction Fact Families within 20

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In this worksheet, we will practice relating addition and subtraction and writing families of addition and subtraction sentences linking the same numbers.

Q1:

We know that 8 plus 7 is 15. Here are the four number sentences for 8, 7, and 15. 8 + 7 = 1 5 1 5 − 7 = 8 7 + 8 = 1 5 1 5 − 8 = 7

Here are some number sentences for 5, 6, and 11. 6 + 5 = 1 1 1 1 − 5 = 6 5 + 6 = 1 1 Which number sentence for 5, 6, and 11, is missing?

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

Q2:

Which number sentence is wrong?

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

Q3:

16 plus 3 is 19. Which number sentence is missing from the number sentences 3 + 1 6 = 1 9 , 1 6 + 3 = 1 9 , 1 9 − 1 6 = 3 ?

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

Q4:

Use 6 + 1 3 = 1 9 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 = 1 0 .

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

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