3 ms·
Memorizing a sequence of ten numbers (or so) sounds way easier than multiplying by 1.6 (or .62) without whipping out a calculator.
by adiabatty 10y ago
Memorizing a sequence of ten numbers (or so) sounds way easier than multiplying by 1.6 (or .62) without whipping out a calculator.
- lostlogin 10y agoIt's not that hard. And if it is, add 50% and a fudge factor.
- tzs 10y agoIf you think of 1.6 as 1 + 1/2 + 1/10, then multiplying by it is pretty easy. For example, 34 x 1.6 = 34 + 17 + 3.4 = 54.4. The exact conversion is 1.609344, so to two places it is 1.61. That's only slightly harder than 1.6. Think of it is 1 + 1/2 + 1/10 + 1/100. So for my prior example, 34 x 1.61 = 34 + 17 + 3.4 + 0.34 = 54.74. The operations needs, taking 1/2, 1/10, and 1/100 of the original value are generally easy in your head. The hardest thing is just keeping track of the running sum as you do that. If you want to go one step farther, you could add a -1/1000 term to bring it to 1.609 but that is probably overkill in most circumstances. Even 1.61 is probably overkill.
- deleted 10y ago[deleted]