Dividing growth rate mentally, quickly

Division
Recent activity on Jan 08, 2019
1 Answer
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Anonymous A asked on Jan 08, 2019

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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Sidi
Expert
updated an answer on Jan 08, 2019
McKinsey Senior EM & BCG Consultant | Interviewer at McK & BCG for 7 years | Coached 350+ 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

(edited)

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McKinsey Senior EM & BCG Consultant | Interviewer at McK & BCG for 7 years | Coached 350+ candidates secure MBB offers
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