Lesson: Relating Addition and Subtraction with Numbers Up to 20

Learn about the relationship between addition and subtraction by using bar models to write inverse equations with numbers up to 20.

Worksheet: Relating Addition and Subtraction with Numbers Up to 20 • 3 Questions

Q1:

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

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

Q2:

Use the picture (if you need to) to see that 17 take away 9 is 8.

Find the missing number in this related addition sentence.

Q3:

Here are two number sentences which have a missing number. Which number completes both of the number sentences?

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