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Expanded notation of 64 = (6 x 10) + (4 x 1)
64 = (6 x 10) + (4 x 1)
64 = (6 x 10) + (4 x 1)
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
964 = (9 x 100) + (6 x 10) + (4 x 1)