eoJ1

21 ms·

1. 1.▲
   by eoJ1 11y ago

   What primary school did you go to, where you had to multiply those kinds of numbers in your head?
2. 2.▲
   by eoJ1 11y ago

   RE your second paragraph, it's easier than it sounds. 637 is an awkward number, we'll start by rounding up to 640: 640 * 2 = 1280, anyone in tech knows 2x that is 2560. Make up the missing 3: 3 * 4 = 12, 2560 - 12 = 2548. 2548 * 1