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# MGMAT: Cube Roots

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Director
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MGMAT: Cube Roots [#permalink]  20 Jul 2008, 11:47
Anyone know how to solve this quickly....I have such trouble calculating cube roots. It's a simple problem, but I was hoping maybe someone knew a trick to calculating cube roots (maybe vedic math...)..

[cuberoot(0.064)] ^ 2 =

0.0016
0.0064
0.04
0.09
0.16
CEO
Joined: 17 Nov 2007
Posts: 3578
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
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Re: MGMAT: Cube Roots [#permalink]  20 Jul 2008, 11:57
Expert's post
$$((0.064)^{\frac13})^2=((\frac{64}{1000})^{\frac13})^2=(\frac{4}{10})^2=\frac{16}{100}=0.16$$
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Director
Joined: 01 May 2007
Posts: 794
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Kudos [?]: 121 [0], given: 0

Re: MGMAT: Cube Roots [#permalink]  20 Jul 2008, 12:05
I found a good tip on another board...pretty useful I think...

* The square root of a decimal will have half as many decimal places as does the original decimal.
* The cube root of a decimal will have one-third as many decimal places as does the original decimal.
Etc.
SVP
Joined: 29 Aug 2007
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Re: MGMAT: Cube Roots [#permalink]  20 Jul 2008, 15:35
jimmyjamesdonkey wrote:
Anyone know how to solve this quickly....I have such trouble calculating cube roots. It's a simple problem, but I was hoping maybe someone knew a trick to calculating cube roots (maybe vedic math...)..

[cuberoot(0.064)] ^ 2 =

0.0016
0.0064
0.04
0.09
0.16

= (0.064)^2/3
= (0.064 x 0.064)^1/3
= (0.4 x 0.4)^3/3
= 0.16
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Manager
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Re: MGMAT: Cube Roots [#permalink]  20 Jul 2008, 19:28
oh.................................
tht can be a easy guess.......
.4^2..
so ans is E
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Re: MGMAT: Cube Roots   [#permalink] 20 Jul 2008, 19:28
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