Draw sets of parallel
lines representing each digit of the first number to be multiplied (the multiplicand, see figs. 1 and 2 further below). Draw sets of parallels, perpendicular to the first sets of parallels, corresponding to each digit of the second number (the multiplier).
http://www.archimedes-lab.org/Maths2_Multiplication.htmlThat seems like a cool trick to multiple multi-digit numbers. It's more effective in some ways than a traditional way and should be taught at school
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It's not.
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She does it all in her head no working out, she has physical muscle memory of abacus.
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23 * 10 = 230
23 * 4 = 92
230 + 92 = 322
That said, while practically the usefulness of this method is questionable, it could be a good idea to teach kids it nonetheless, if only to improve their math intuition.
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