Lesson: Relating Addition and Subtraction with Numbers up to 20

In this lesson, we will learn how to relate addition and subtraction using bar models to write inverse equations with numbers up to 20.

Worksheet: Relating Addition and Subtraction with Numbers up to 20 • 7 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:

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

Q3:

We know that .

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

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