Here are some of my favorite math tricks. Add the number to itself {in other words double it}. Example 4 times 9: doublwe 9 is 18 double 18 is 36 that one is pretty simple heres another. Cut it in half 10 times Example 5 times 6 cut 6 in half to get 3 then times 10 for 30 or times 10 then cut in half. Example 5 times 9 : 9 times 10 is 90 the cut it in half for 45 also the last digit goes 5, 0, 5, 0 ... like this 5, 10, 15, 20 .
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