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# MGMAT: Cube Roots

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Director
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MGMAT: Cube Roots [#permalink]

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20 Jul 2008, 12:47
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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
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Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
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Re: MGMAT: Cube Roots [#permalink]

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20 Jul 2008, 12:57
$$((0.064)^{\frac13})^2=((\frac{64}{1000})^{\frac13})^2=(\frac{4}{10})^2=\frac{16}{100}=0.16$$
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Director
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Posts: 793
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Re: MGMAT: Cube Roots [#permalink]

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20 Jul 2008, 13:05
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.
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Re: MGMAT: Cube Roots [#permalink]

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20 Jul 2008, 16:35
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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Re: MGMAT: Cube Roots [#permalink]

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20 Jul 2008, 20:28
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, 20:28
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# MGMAT: Cube Roots

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