Hi there,

I agree with David, most interviewers would be fine if you just round the denominator to make the calculation slightly easier (it is all about being 80/20) - if the interviewer insists against the rounding, then it's normal to ask to solve it by hand.

Best of luck in the process.

Khaled

(edited)

Hello,

Maybe other people will have better ideas than me on this, but I fear that certain divisions must really be put on paper. But I still advise you to propose rounding to your interviewer before embarking on complicated calculations (e.g. divide 25k / 40 vs. 25k / 42).

Best,

David

Hi, in addition to all the advices of other coaches I recommend this YT channel - very useful for divisions and math tricks in general:
https://www.youtube.com/playlist?list=PLjbxBzUM6SLnSYop8JXLu9zciW-rn7yyD

Hope it helps,
Antonello

Ps. Preplounge math tool then is great to practice it: https://www.preplounge.com/en/mental-math.php

Hello!

Whenever you find those odd divisions in an MBB/consulting interview, be careful. It´s precisely a trap to see if you can simplify.

For instance, to your examples:

• 25,000 / 42:
  • Round up 42 to 40
  • 40 is 4/10, or 2/5
  • Now it´s much easier:
    • Divide 25,000/5
    • Then multiply per two

Hope it helps!

Cheers,

Clara

Dear A,

You can make your calculations easier with round the last number or for division process itself you can put asid all the nulls (but then don't forget to put them back).

Like 25k/42

25 000/40

25/40--> 24/4---> 6

600 appr

Whould it be ok?

Good luck,

André

(edited)

Hi there,

I highly recommend the following resources:

• Online "Drills": https://www.jetpunk.com/quizzes/fast-math-multiplication-quiz
• Math sheets (print these and do them on paper): https://www.math-drills.com/
• Rocketblocks: https://www.rocketblocks.me/