2 ms·
But it’s the principles that matter, not the tables. If you understand the principles you can easily figure out 563*3557. If you only know the tables you get st
by Aeolun 3y ago
But it’s the principles that matter, not the tables. If you understand the principles you can easily figure out 563*3557. If you only know the tables you get stuck on 16x21.
Though I agree that it’s convenient if multiplying anything under 10 is a idempotent action :)
- spywaregorilla 3y ago16 x 21 = (16 * 2 * 10) + 16 => (8 * 4 * 10) + 16 => 320 + 16 => 336 Is... that not how most people do mental math? I instinctively reduce everything to familiar patterns largely based on single digits numbers tables. 563 * 3557 is about 600 * 4000 => 6 * 4 * 100000 => about 2.4M Are other people doing the standard algorithm visualized somehow?
- tomp 3y agoI urge you to "figure out" 5633557 in base 9. Guess what? You'll first need to manually* derive the approximate "multiplication tables" (for individual digits), only then you'll be able to multiply multi-digit numbers.