2

Mental math - division

Hi everyone,

I feel pretty confident in my mental math skills, but sometimes I need additional time with division. Could you give me some hints for examples below.

-2.3/3.6 - I would multiply by 10 - 23/36 ≈ 60%

-70/85% - no clue for a shortcut

-707k/ 18 910 - 7 * 10^5 / 1.89 * 10^4 -- I know it is between 3.5 and 4, but don't know the exact

-88/1400 -- ?

Would love to hear your mental processes, thank you!

Hi everyone,

I feel pretty confident in my mental math skills, but sometimes I need additional time with division. Could you give me some hints for examples below.

-2.3/3.6 - I would multiply by 10 - 23/36 ≈ 60%

-70/85% - no clue for a shortcut

-707k/ 18 910 - 7 * 10^5 / 1.89 * 10^4 -- I know it is between 3.5 and 4, but don't know the exact

-88/1400 -- ?

Would love to hear your mental processes, thank you!

2 answers

  • Upvotes
  • Date ascending
  • Date descending
Best Answer
Book a coaching with Vlad

97% Recommendation Rate

388 Meetings

7,310 Q&A Upvotes

USD 299 / Coaching

Hi,

Simply learn the division table up to 1/11 (i.e. 5/6 = 83.3%). It will help you calculate any percentage problems. For example, if your market is $620M and your revenues are $51M you can use 5/6 as a proxy to calculate the market share

Best!

Hi,

Simply learn the division table up to 1/11 (i.e. 5/6 = 83.3%). It will help you calculate any percentage problems. For example, if your market is $620M and your revenues are $51M you can use 5/6 as a proxy to calculate the market share

Best!

There is just one thing: practice, practice, practice, ...

There is just one thing: practice, practice, practice, ...

Related case(s)

Coronavirus Times - COVID-19 Brainteaser

Solved 700+ times
Coronavirus Times - COVID-19 Brainteaser You and your family are faced with a challenging set of decisions. Due to coronavirus, your partner has taken a 20% paycut and you are worried you may lose your job. In addition, while daycare is still open, you are worried that sending your two children there will increase the risk of them bringing the virus back to your house, where your elderly grandparents are also staying. How would you go about thinking about this problem, and what would you recommend?
4.5 5 22
| Rating: (4.5 / 5.0)
Difficulty: Beginner | Style: Brain Teaser | Topics: Brain teaser

You and your family are faced with a challenging set of decisions. Due to coronavirus, your partner has taken a 20% paycut and you are worried you may lose your job. In addition, while daycare is still open, you are worried that sending your two children there will increase the risk of them bringing ... Open whole case