I have problems getting a decent score in the hard section of the "percent" exercises in the Mental Math tool here on the site.
Any tips on how to solve this kind of complex operations?
(edited)
Get Active in Our Amazing Community of Over 451,000 Peers!
Schedule mock interviews on the Meeting Board, join the latest community discussions in our Consulting Q&A and find like-minded Case Partners to connect and practice with!
Any tips on how to calculate
Overview of answers
Upvotes
Best answer
Another little tip is to practice with multiplications, rather than divisions. It seems to be easier on the brain.
E.g. 30% of 7 is easier done this way:
1) 7 x 30 = 210
2) Divide by 100.
Was this answer helpful?
All good tips below. Ultimately it comes down to personal preference. My tips for dealing with percentages (especially complex ones): think of everything in terms of divisions of 10 and 2 --> i.e. almost any percentage, you can reach by dividing your initial number by 10 or by 2
Example - 37.5% of 460:
- 30% =3*10% = 46*3= 138
- 5% = 23
- 2.5% = 11.5
37.5% = 138+23+11.5 =172.5
Hope this helps!
Alessandro
Was this answer helpful?
Hi,
Simply learn the division table up to 1/11 (i.e. 5/6 = 83.3%). It will help you calculate any percentage problems
Best
Was this answer helpful?
Practice, practice, practice...
Also, there are some shortcuts I find useful:
- 90% of X - just divide X by 10 and subtract from X.
- x% of 1xx - maybe easier to take (x% * 100) + (x% * xx)
- 20 / 40 / 60 / 80% of 65 / 75 / 85: Take 20 / 40 ... % of 70 / 80 / 90 and subtract 1 / 2 / 3 / 4. So 40% of 65 = 40% of 70 - 2 = 28 - 2 = 26
Was this answer helpful?
Related Cases
Expert case by Francesco
Our client is SmartBridge, a nonprofit educational institution offering face-to-face tutoring services. The client operates in the US.The mission of SmartBridge is to help as many students as possible to complete studies and prevent that they drop from the school system, in particular in disadv
...
Our client is SmartBridge, a nonprofit educational institution offering face-to-face tutoring services. The client operates in the US.The mission of SmartBridge is to help as many stude
...
(Open whole case)
31.6k
Times solved
Advanced
Difficulty
Expert case by Francesco
Style:
Our client is a BlissOttica, an Eyewear Manufacturer that is looking to reach a 10% increase in profits. How would you help our client?
Our client is a BlissOttica, an Eyewear Manufacturer that is looking to reach a 10% increase in profits. How would you help our client?
(Open whole case)
13.6k
Times solved
Intermediate
Difficulty