# Mckinsey Preparation Material (Math, Economics and Accounting)

McKinsey
Edited on Aug 29, 2020
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Not very confident on math and economic/accounting knowledge. Are there some training books especially designed for Mckinsey. Heard of Mckinsey way, Mckinsey method....look for recommendations. Coincidently heard of 72% princeple. How can I be sure that I will not miss the major Mck math skills/models? For sure, I don't need to do PST. However, the skills might be needed in cases...

Thank you for advices in advance! Look forward to hearing former Mck successful experiences!!!

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Hi,

Something that helped my candidates - download ALL casebooks available online and go through the math problems in the cases. They will give a good sense of required business terminology. Then you can google what you don't know.

P.S. don't follow the books solutions to solving the cases since they are not that good. Just practice the math problems

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
• Ratio & Proportions
• Little's Law
• Solving the problems by calculating the area of the triangle
• 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!

Best

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(edited)

Dear A!

1. For practicing and improving your mental math you can also find some apps and tools, besides Victor Cheng’s math tool (Magoosh's mental maths app, Mental math cards challenge app, etc)
2. To practice your quantitative skills I would recommend different math, logic, and verbal tests on https://trytalentq.com/how-to-prepare/# and then select "Elements Practice Test".You don´t need to learn them by heart, rather skipping through to get a first impression and a better understanding
3. I'd also advise you purchase to the McKinsey case book, which can help you better understand the whole interview mechanics and what happens behind the stage.

If you have further questions about your preparation, just drop me a line!

Best,

André

(edited)