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# Number rainbow and fact families with 13

This video helps students practice subtraction facts where you subtract from 13, such as 13 − 5 and 13 − 7. For that, we use both fact families with 13, and a NUMBER RAINBOW.

In the number rainbow, we connect two numbers with an arc if their sum is 13. This visual tool clearly shows students how the numbers are paired to make 13.

We also briefly go through all the fact families with single-digit numbers where the sum is 13 (one with 3 + 10, another with 4 + 9, then one with 5 + 8, and one more with 6 + 7).

Lastly I drill the viewers with the subtraction facts — Mathy joins in that also! I pause for a little while to let children answer the facts — thus this video can take the place of drilling by a teacher.

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

Fact families — free online practice

Number rainbow & fact families with 11

Number rainbow & fact families with 12

Number rainbow & fact families with 14

Math Mammoth Grade 2 curriculum

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