3 ms·
it's hardly practical. Yes, interesting, but I would not use it at all. The way I know how to do multiplication "manually" is superior than this. You line up nu
by shn 14y ago
it's hardly practical. Yes, interesting, but I would not use it at all. The way I know how to do multiplication "manually" is superior than this. You line up numbers on top of each other. Then you start multiplying first digit of the bottom number with all the digits of above number, from right to left and adding any carry over. You start writing the result on the same column you are multiplying. Then you add them all.
123
123
x______
369
246
123
+________
15129
That's what I learned in elementary school and have been using since then. It's interesting to know how others to do it.
- signa11 14y ago> That's what I learned in elementary school and have been using since then. It's interesting to know how others to do it. well, i generally do it using a 'covolution approach' like this: 45 x 86 ------ 0 (5*6 == 30) -> take the units place, and put '3' as carry over 4 (6*4+8*5+3 == 47) -> take the units place, and put '4' as carry over 36 (8*4+4 == 36) ------------- 3640 ------------- with sufficient practice, you can multiply arbitrary 3 digits in approx 10-15 seconds or so ;) [edit-1]: my formatting sucks, cannot seem to align stuff nicely at all.