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CLIMBTHELADDER
Joined: 14 Feb 2016
Last visit: 16 Jan 2019
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Schools: ESADE '17 ESSEC '18 St.Gallen'17 Bocconi '17
04 Mar 2016, 05:42
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My mind got so used to using my 'smart' phone to do basic multiplications and divisions, and I lost the capability to do basic math. If you're like me and need to improve on basic math. Use the following mnemonic techniques to improve your basic math skills:
(i) Round off to approximates, once the answer options are largely dispersed round off to approximates. 475 becomes 500. This simplifies multiplications and divisions.
Don't round off to approximates when the answer options are A) 47.5 B) 50. C) 52.5
(ii) Aggressively simplify fractions;
15 3
-- = --
100 20
In the case, you have trouble recognizing fractions practice using the math trainer link given below.
(iii) Easy percentages.
10% of number x?; move the number one decimal point to the left
1% of number x?; move two decimal points to the left.
89% of number x?; number -10% minus 1%
For example:
89% of 250
10% of 250 = 25
= 250 - 25 = 225
1% of 250 = 2.5
= 225 - 2.5 = 222.5
This technique saves you time, instead of taking 10% of 250, and 1% of 250 and adding that up and subtracting that with the total amount takes longer and increases the risk of making a mistake, so save time by subtracting immediately and follow the chronological order as described above.
(iv) Multiplications
x 5 ? --> multiply by 10, divide by 2
x 21 ? --> multiply by 20 add 1 multiple
x 39. 5 ? --> multiply by 40 subtract 0.5 of the multiple.
For example:
13(39.5)
= 13(40-0.5) = 520 - 6.5
= 513.5
Another example:
15(23)
= 15 (20+3) = 300 + 45 = 345
(v) Simplify divisions: find the nearest multiplier.
162 / 4 =
4 (40) = 160
+ 2 = 0.5
(40+0.5) = 40.5
In case you have difficulty recognizing the divisions, fractions, percentages, and subtractions use this to improve your mental mathematic skills. https://www.mathsisfun.com/numbers/math ... tiply.html
It identifies your weaknesses and gives you practice drills accordingly. I intend to do this for 1 or 2 weeks every day during my regular studying period, and during lunch to get to the required level. This might seem trivial to many people here, but I am a rookie just starting out with a GMAT score of 260 sharing what I learn. Looking forward to your feedback and hope this helps!
Regards,
(i) Round off to approximates, once the answer options are largely dispersed round off to approximates. 475 becomes 500. This simplifies multiplications and divisions.
Don't round off to approximates when the answer options are A) 47.5 B) 50. C) 52.5
(ii) Aggressively simplify fractions;
15 3
-- = --
100 20
In the case, you have trouble recognizing fractions practice using the math trainer link given below.
(iii) Easy percentages.
10% of number x?; move the number one decimal point to the left
1% of number x?; move two decimal points to the left.
89% of number x?; number -10% minus 1%
For example:
89% of 250
10% of 250 = 25
= 250 - 25 = 225
1% of 250 = 2.5
= 225 - 2.5 = 222.5
This technique saves you time, instead of taking 10% of 250, and 1% of 250 and adding that up and subtracting that with the total amount takes longer and increases the risk of making a mistake, so save time by subtracting immediately and follow the chronological order as described above.
(iv) Multiplications
x 5 ? --> multiply by 10, divide by 2
x 21 ? --> multiply by 20 add 1 multiple
x 39. 5 ? --> multiply by 40 subtract 0.5 of the multiple.
For example:
13(39.5)
= 13(40-0.5) = 520 - 6.5
= 513.5
Another example:
15(23)
= 15 (20+3) = 300 + 45 = 345
(v) Simplify divisions: find the nearest multiplier.
162 / 4 =
4 (40) = 160
+ 2 = 0.5
(40+0.5) = 40.5
In case you have difficulty recognizing the divisions, fractions, percentages, and subtractions use this to improve your mental mathematic skills. https://www.mathsisfun.com/numbers/math ... tiply.html
It identifies your weaknesses and gives you practice drills accordingly. I intend to do this for 1 or 2 weeks every day during my regular studying period, and during lunch to get to the required level. This might seem trivial to many people here, but I am a rookie just starting out with a GMAT score of 260 sharing what I learn. Looking forward to your feedback and hope this helps!
Regards,
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