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gayanep
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Manhattan GMAT Fractions book 14 Apr 2014, 17:20
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Hi,

I was just going through the 1st book of the Manhattan Gmat guides (Fractions, Decimals and Percents, 5th Edition) and on page 58 where they are discussing percent changes, they say "You can save time by noticing that 720 and 1800 are both divisible by 360" (referring to a fraction 720/1800- although the context doesnt really matter here). My question is, how do you NOTICE something like this? What is the trick to being able to recognize factors/multiples in large numbers in order to reduce fractions quickly?

Hope my question is clear.

Thank you all!



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Manhattan GMAT Fractions book 15 Apr 2014, 23:28
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gayanep
Hi,

I was just going through the 1st book of the Manhattan Gmat guides (Fractions, Decimals and Percents, 5th Edition) and on page 58 where they are discussing percent changes, they say "You can save time by noticing that 720 and 1800 are both divisible by 360" (referring to a fraction 720/1800- although the context doesnt really matter here). My question is, how do you NOTICE something like this? What is the trick to being able to recognize factors/multiples in large numbers in order to reduce fractions quickly?

Hope my question is clear.

Thank you all!
Show more


Hi gayanep,

You see 720/1800 is actually still easy....can be reduced to 72/180 or 72 is 40% of 180... 40% can be written (2/5)*100
Note that 72(18*4) is a multiple of 18 so knowing your tables till 20 will definitely help to begin with. You should also if possible memorize fractions till 20...

Check out these posts.You should find them helpful
what-arithmetic-should-i-memorize-80128.html#p602003
new-to-the-math-forum-please-read-this-first-140445.html
how-to-improve-your-quant-from-q44-to-q50-141670.html

Do use Search options to get more out of GC...

See you around



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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!