2 ms·
Even better: 16 * 18 = (17-1)*(17+1) = 17^2-1 = 289-1 = 288. Provided of course you know your squares.
by cozzyd 11y ago
Even better:
16 * 18 = (17-1)*(17+1) = 17^2-1 = 289-1 = 288.
Provided of course you know your squares.
- Cyph0n 11y agoAh that's a good one. I had powers of 2 in mind.