Got rejected due to slow math skills during the case interview. Any mental math resource I can use to do math fast?

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Practice. Sudoku. Ditch the calculator

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Rocket blocks is great

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Agreed!! Did the free trial version and that even helped me tremendously

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Never having done a case, what math questions are they using to screen?

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Example: Market Sizing Case of Product Entry in X Country/User Base

Population
Divide population into people who would use and who wouldn’t
Divide users into frequency of purchase (I.e. once a year, once a month, and once a week)
Find out quantity of product (Q) sold at each sale

Now to find yearly quantity of products sold you can do:
(Once a Year Users * Q) + (Once a Month Users * Q * 12) + (Once a Week Users * Q * 52)

With that you can ask further questions on price sold, profit margin, COGs, etc to back up your original hypothesis or get to an answer of if the client should or shouldn’t enter the market with X new product

All this happens within the allotted case time and while you can round up here and there (of course ask the interviewer ahead of time) they more or less expect you to be right on the money in terms of the number you calculate so you can continue with the rest of the case

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What's 19x37? Do this without using a calculator in under 10 seconds.

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Doesn’t need to be under 10 seconds but should be able to walk through it quickly: (20*37)-37, 37*2=74, add the zero = 740, subtract the 37. 703. But you’ll never see this kind of math in an MBB case

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Flash cards

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