Let’s Find the 10s

You can do this activity with your students at the board or on worksheets.

Provide them with a really long horizontal sum. Something like this:

3 + 11 + 7 + 5 + 5 + 4 + 9 + 1 + 2 + 13 + 8 =

The idea here is to group pairs of numbers into tens or multiples of ten so that they can quickly and easily find the sum using mental math.

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