“We’re going to go over three sort of tricks of mental math that I use consistently as I do math problems to help me.”
Mental calculation is an indispensable task in management consulting. Even during case interviews, it’s evident that prestigious firms such as McKinsey, Bain, and BCG look for candidates who are number smart—who can analyze and interpret quantitative information without relying solely on a calculator. It’s impossible to learn advanced mental math techniques if you’re not skilled in the basic operations, percentages, fractions, and ratios. Start by adding, subtracting, multiplying, and dividing two or three-digit numbers. Then proceed with squaring numbers and using the art of guesstimation. In the long run, you’ll be surprised to instantly figure that 70,154 is a multiple of 7.
https://www.youtube.com/watch?v=yuRVftUT1vQ&rel=0
Key Takeaways:
- Partial Product multiplication – seperate out the 10s from the single digits and then add the products
- Round then compensate – round up, round down and then multiply the missing factors to subtract from total for response
- Use the 10% method- find 10% of an amount and then multiply by the percent you wish to get to.
“We’re going to go over three sort of tricks of mental math that I use consistently as I do math problems to help me.”
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