Lesson Worksheet: Relating Addition to Subtraction: Numbers up to 20 Mathematics • 1st Grade

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?

  • A11−6=5
  • B11−5=6
  • C11−6=6
  • D6−5=11
  • E5+6=11

Q2:

Which number sentence is wrong?

  • A12+4=8
  • B4+8=12
  • C12−8=4
  • D8+4=12
  • E12−4=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?

  • A19−3=14
  • B16+3=19
  • C19−3=16
  • D16−3=13
  • E19−16=3

Q4:

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

13+=19

19−6=

−13=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=.

Q8:

This domino has 13 dots. How many dots are hidden?

Q9:

We know that 18 takeaway 7 is 11.

Here are the four number sentences for 18, 7, and 11. 7+11=1818−7=1111+7=1818−11=7

Now, think about the numbers 3, 4, and 7.

Which of the number sentences below does not belong?

  • A7−4=3
  • B7−4+3
  • C3+4=7
  • D4+3=7
  • E7−3=4

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