First, 10x13 = 130. So, a number 13 less than this is 130 - 13 = 117.
Put simply 9x13 instead of 10x13 ie 13 less.
the answer is 117
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x+10>13 it wouldn't be x+10-13 ??
(9/13) / (10/13) =(9/13) x (13/10) =9/10
x + 13
15 x 13 = 195A simpler way of breaking this down is:15 x 13 =(10 + 5) x (10 + 3) =(10 x 10) + (10 x 3) + (10 x 5) + (5 x 3) =100 + 30 + 50 + 15 = 195
x - 10