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Addition with a missing value

This math skill teaches how to solve addition equations with a missing value, using step-by-step reasoning to find the number that, when added to another given number, equals a specified total.

Learn addition with a missing value

Teaching Transcript

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9 plus what number equals 12?

We know that if we add 1 to 9 we will get 10

But we need two more to get 12, so add another 2

So our mystery number is 1 and 2, or 3. 9 plus 3 equals 12

Skill Practice

Addition with a missing value

Test your understanding of addition with a missing value by practicing it! Work through the below exercises to use it in practice.