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# Math concepts

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New answer on Jul 17, 2020
2.4 k Views

Hi! Is there an exhaustive lost of all the possible math concepts one would need to know for case interviews?

• Date ascending
• Date descending

Hi,

Here is a set of things you need to know:

1) Math and formulas:

• Interest rates calculations
• Compound margin
• NPV using the Rule of 72, Perpetuity
• CAGR using the Rule of 72
• Currencies exchange calculations
• Speed, time, distance calculations
• Equations, systems of equations
• Integral (calculating the area of geometric figures to solve case problems)
• Ratio & Proportions
• Little's Law
• Profit / breakeven formula
• Correlations, outliers (being able to spot on the graphs, tables)

2) Fast math skills

• Rounding up and down
• Learn how to multiply double digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo)
• Learn the division table up to 1/11 (i.e. 5/6 = 83.3)
• Learn how to work with zeros using powers (e.g.: 4000000 = 4*10ˆ6)

Use math tools (Mimir math for iOS), Math tool on Viktor Cheng website to practice

3) Working with tables and graphs and deriving conclusions

• Study "Say it with Charts" book
• Check all available MBB presentations and publications. Practice to derive conclusions and check yourself with the actual ones from the article / presentation
• GMAT IR part (Official guide and Manhattan prep)
• Learn basic statistics (Any GMAT or MBA prep guides)

Good luck!

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2. In addition to that, you can ask other PrepLoungers to case you on chart/math-heavy cases. You can also search for those case types here and work through them yourself.

Some key formulas/concepts:

• Breakeven
• NPV (with + without growth, perpituity + 1-2 years from now)
• % Change
• ROI
• Margin
• Markup
• Inventory turnover

(edited)

Hello, plz PM me!

Dear A,

Here is some financial formula you need you know:

• Revenue

• Fixed and variable costs

• Profits

• Return on investment

• Payback period

Best,

André