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Hi Everyone,
Although GMAT doesn't test your ability to perform complicated calculations, it would be beneficial to know some calculation tricks that would save you some time.
Trick 7: Rapidly Square Any Number Ending in 5
Multiply the tens digit by the next whole number then affix the number 25
\(65^2: 6*7=42 ==> 'affix' 25 ==> 4225\)
Trick 8: Rapidly Multiply Any Two-Digit Number by 11
Write the number leaving some space between the two digits, then insert the sum of the number's two digit in between.
24*11 ==> 2 ? 4 ==> 2+4=6 ==> 264
Trick 9: Rapidly Multiply by 25 (or 0.25, 2.5, 250, etc.)
Divide the number by 4 and affix or insert Zeroes or decimal points
Example: 28*25 ==> 28/4 = 7 ==> 700 (add 2 Zeroes)
Trick 10: Rapidly Divide by 25 (or 0.25, 2.5, 250, etc.)
Remove Zeroes or decimal points then multiply the number by 4
Example: 700/25 ==> 7/25 ==> 7*4=28
Trick 24: Rapidly Square Any Two-Digit Number ending in 1
\(21^2 \\
==> 20^2=400\\
==> Add: 20+21=41\\
==> Add: 400+41= 441\\
==> 21^2 = 441\)
Trick 59: Rapidly Multiply Any Three-Digit Number by 11 (advanced variation of trick 8)
Write the number leaving some space between the two digits, then insert the summations of the numbers in between (summations of 2 digits everytime; as shown below).
Example:
342*11=??
342*11= 3--2 (write the first & the last number "3"& "2")
342*11=3-62 (the sum of 4+2)
342*11=3762 (the sum of 3+4)
Source: Rapid Math Tricks & Tips. EDWARD H. JULIUS
Although GMAT doesn't test your ability to perform complicated calculations, it would be beneficial to know some calculation tricks that would save you some time.
Trick 7: Rapidly Square Any Number Ending in 5
Multiply the tens digit by the next whole number then affix the number 25
\(65^2: 6*7=42 ==> 'affix' 25 ==> 4225\)
Trick 8: Rapidly Multiply Any Two-Digit Number by 11
Write the number leaving some space between the two digits, then insert the sum of the number's two digit in between.
24*11 ==> 2 ? 4 ==> 2+4=6 ==> 264
Trick 9: Rapidly Multiply by 25 (or 0.25, 2.5, 250, etc.)
Divide the number by 4 and affix or insert Zeroes or decimal points
Example: 28*25 ==> 28/4 = 7 ==> 700 (add 2 Zeroes)
Trick 10: Rapidly Divide by 25 (or 0.25, 2.5, 250, etc.)
Remove Zeroes or decimal points then multiply the number by 4
Example: 700/25 ==> 7/25 ==> 7*4=28
Trick 24: Rapidly Square Any Two-Digit Number ending in 1
\(21^2 \\
==> 20^2=400\\
==> Add: 20+21=41\\
==> Add: 400+41= 441\\
==> 21^2 = 441\)
Trick 59: Rapidly Multiply Any Three-Digit Number by 11 (advanced variation of trick 8)
Write the number leaving some space between the two digits, then insert the summations of the numbers in between (summations of 2 digits everytime; as shown below).
Example:
342*11=??
342*11= 3--2 (write the first & the last number "3"& "2")
342*11=3-62 (the sum of 4+2)
342*11=3762 (the sum of 3+4)
Source: Rapid Math Tricks & Tips. EDWARD H. JULIUS
Archived Topic
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23 Oct 2017, 01:47
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01 Nov 2017, 07:43
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Updated with Tricks 9 & 10
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
