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Mental math - division

Anonymous A asked on Sep 16, 2019 - 1 answer

Hi everyone,

I feel pretty confident in my mental math skills, but sometimes I need additional time with division. Could you give me some hints for examples below.

-2.3/3.6 - I would multiply by 10 - 23/36 ≈ 60%

-70/85% - no clue for a shortcut

-707k/ 18 910 - 7 * 10^5 / 1.89 * 10^4 -- I know it is between 3.5 and 4, but don't know the exact

-88/1400 -- ?

Would love to hear your mental processes, thank you!

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Vlad
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replied on Sep 17, 2019
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Hi,

Simply learn the division table up to 1/11 (i.e. 5/6 = 83.3%). It will help you calculate any percentage problems. For example, if your market is $620M and your revenues are $51M you can use 5/6 as a proxy to calculate the market share

Best!