121×13 13×1(00) -> 13(00) 13× 2(0) -> 26(0) 13 × 1 -> 13 1300+260+13 1300+ ..260+ ....13 =1563 In my head about 5 seconds max?
Well, in this case I'd basically ignore the first step due to the low nunbers not really needing me to multiply them So I'm directly at the second part. A different number might have been longer As for how... i dunno
This 121/13 is division right? and 121×13 is multiplication right? So now here is another question that should be asked, how did division become multiplication? https://i.kym-cdn.com/entries/icons/mobile/000/021/464/14608107_1180665285312703_1558693314_n.jpg
.... *embarrassed cough* Thats how good i am at reading! *sweats* 121/13 13 × 9 = 117 121 - 117 = 4 4/13 = 3.0something
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