Good resources to prep mental math for McKinsey interview?

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Quick Math Trick:

Percentages are reversible. 8% of 25 is the same as 25% of 8 and one of them is much easier to do in your head.

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What kind of sorcery is this

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Case Interview Math | Caseinterview
https://www.caseinterview.com/category/case-interview-articles/case-interview-math

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I second that

An abacus

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Rocket blocks

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Lol C2 people are suggesting RB's core feature of practicing math, not the articles! It is undeniably RB is useful for enhancing different skills at one's free time without doing the entire case.

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Calculate the tip in your head

Just the tip

Going to grocery and calculating dollars per ounce or other unit price. Check your math on labels.

Quick Brain and Math Tricks are good apps for this purpose

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