And so on, and I’d do some of the intermediate calculations as I go (e.g. 20*440 and 6*440).
But that’s only really needed if I need a precise answer. If I can get away with an estimate, I’ll simplify it even more:
4000*430~=43*4*10000=86*2+10000=1,720,000
Actual answer: 1,740,612. 4000*440 would be easier (I like multiplying 4s), but I know it would overshoot, so I round one up and the other down. Close enough for something like estimating how much a large quantity of something kind of expensive would cost (i.e. if my company gave everyone a hot tub or something).
For me:
3974 * 438 -> 4000 * 438 - 26*438 -> 4000 * 438 - 26*440 - 26*2 -> 4000 * 438 - 20*440 - 6*440 - 26*2And so on, and I’d do some of the intermediate calculations as I go (e.g.
20*440and6*440).But that’s only really needed if I need a precise answer. If I can get away with an estimate, I’ll simplify it even more:
4000 * 430 ~= 43 * 4 * 10000 = 86 * 2 + 10000 = 1,720,000Actual answer:
1,740,612.4000 * 440would be easier (I like multiplying 4s), but I know it would overshoot, so I round one up and the other down. Close enough for something like estimating how much a large quantity of something kind of expensive would cost (i.e. if my company gave everyone a hot tub or something).