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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: 60102+3102+560
by angel_j 7y ago
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: 60102+3102+560+53
- Strilanc 7y agoThat's schoolbook multiplication. It has quadratic complexity in the number of digits.