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Anonymous
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13x10=130 13x3=+ 39 169 if you times it by 3 then 10 u would timesing it by 30
1302 = 16,900A handy shortcut you can use is if you know that 132 is 169, you can do(13x10)2 = (13)2(10)2 = 169 x 100 = 16,900.