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Anonymous A
on Jan 08, 2019
Global
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Dividing growth rate mentally, quickly

Hello,

How can you divide mentally 80/1.25 for example? Multiplying is quite easy but dividing is hard due to the compound effect with division. Happy to hear any solutions or tips. 

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Top answer
Sidi
Coach
edited on Jan 08, 2019
McKinsey Senior EM & BCG Consultant | Interviewer at McK & BCG for 7 years | Coached 400+ candidates secure MBB offers

Hi Anonymous!

just translate all figures to fractions:

1.25 is equal to 5/4 ==> hence 80/(5/4) = 80*4/5 = 320/5 = 64

Cheers, Sidi

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