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Mental Math - Exponent

Bain BCG Mck Quantitative skills
Neue Antwort am 30. Dez. 2020
5 Antworten
974 Views
Anonym A fragte am 23. Nov. 2020

Hi,

How can I please calculate (1.25)^5 mentally?

Thanks a lot!

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Udayan
Experte
Content Creator
antwortete am 23. Nov. 2020
Top rated Case & PEI coach/Multiple real offers/McKinsey EM in New York /6 years McKinsey recruiting experience

Not needed - if you ever see yourself with a problem like this either you have done something wrong or there is a simple way to do it (e.g., Rule of 72)

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Ian
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antwortete am 23. Nov. 2020
#1 BCG coach | MBB | Tier 2 | Digital, Tech, Platinion | 100% personal success rate (8/8) | 95% candidate success rate

Allen has an excellent approach! The goal of math in casing is not to see if you can multiple super hard numbers together like an engineer. The goal is generally, can you figure out quick-and-dirty approaches to complicated situations, to get to the general answer that matters.

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Allen
Experte
antwortete am 23. Nov. 2020
Ex-McK Experienced Hire and EM - I show you how to perform at your best

Don't worry about this! You will rarely have to do complex calculations in your head. Consultants don't need to do this.

Instead, what I'd focus on is that at a 25% growth rate, you'll double in approximately 3 years (due to rule of 72) and then add the same amount again in the next 2 years approximately (due compound growth). In summary, therefore, you can triple in 5 years, so the answer should be around 3. (In reality, when I calculate electronically, the answer is 3.05)

Does this help?

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Anonym A am 23. Nov. 2020

Very helpful! It's good to know I don't need to focus on complex calculations

Florian am 2. Feb. 2024

How did you approximate that the initial value would be added again after 2 years?

Antonello
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antwortete am 30. Dez. 2020
McKinsey | NASA | top 10 FT MBA professor for consulting interviews | 6+ years of coaching
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Gaurav
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Content Creator
bearbeitete eine Antwort am 28. Nov. 2020
Ex-Mckinsey|Certified Career Coach |Placed 500+ candidates at MBB & other consultancies

Hello! I agree that you do not need to make complex calculations in your head and that your approach to solve difficult problems is more important.
Hope it helps,
All the best
GB

(editiert)

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