391
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expanded is longer standerd is just regular partial products to find like standerd means simple your level. expanded means longer to stretch, or 2 make big.
YES (i think)
I'm not entirely sure I know what you mean by "expanded algorithm" but here is a guess: 31 * 19 = (13 * 9)+(31 * 10) = 117 + 310 = 427
to check your answer to check if ti is right .
The prime factors of 136 are 2x2x2x17 (or 23x17).