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angel_j
on April 27, 2019
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A New Approach to Multiplication Opens the Door to...
I learned to do multiplication in my head in a similar way, except I'd usually split on a multiples of 10 for simplicity.
For 25x63, I would go: 60
10
2+3
10
2+5
60+5
3
Strilanc
on April 27, 2019
[–]
That's schoolbook multiplication. It has quadratic complexity in the number of digits.
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For 25x63, I would go: 60102+3102+560+53