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An introduction or beginner lesson on addition problems with a missing number - also called "missing addend problems".

For example, we consider the problem 1 + ___ = 4, but since children tend to confuse this with 1 + 4, I start out by placing the TOTAL at the top of the visual model (dots on die faces). So, it reads kind of like:

4

1 + __

This positioning is to help children understand better the concept, and not to get a misconception that it means 1 + 4.

From that we then transition to the regular way to write the addition horizontally, such as ___ + 2 = 3.

Lastly in the lesson we even drop the visual model of dots — by this time the children can probably think the answers and get them correct!

This lesson is meant for early 1st grade or kindergarten. I use very small numbers (from 0 to 5) so that even young children can understand the idea.

If you cannot see the video above, click here for an alternative video player.

Addition facts — online practice (includes an option for missing number additions)

Mental math trick with nine and eight

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