Here are five cool examples—and the math behind them.

35 x 4  35 x 2 x 2  70 x 2  140

4 x 9 = 36    —>   3 + 6 = 9 9 x 9 = 81    —>  8 + 1 = 9

52 x 11  5 (5+2) 2  572

7 x 12 7 x 10 = 70 7 x 2 = 14 70 + 14 = 84

Is 543 divisible by 3? 5 + 4 + 3 = 12 12 is divisible by 3 So 543 is divisible by 3

If your fifth grader is still struggling with her multiplication tables, these can be a godsend.

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