# Worksheet: Relating Addition to Subtraction: Numbers up to 20

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

**Q7: **

We know that . Use the picture to check this if you need to.

Use this addition fact to find the missing number in the subtraction sentence .

**Q8: **

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

**Q9: **

We know that takeaway is .

Here are the four number sentences for 18, 7, and 11.

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

Which of the number sentences below does not belong?

- A
- B
- C
- D
- E