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Math Question

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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Re: Math Question

by logitech » Fri Jan 09, 2009 7:45 pm
Sprite_TM wrote:okay,

can someone tell me an easy way to find the hundredth digit in (321)^4 without doing crazy calculations?
321 x 321 = blablabla 41

blablabla 41 x blablabla 41 = will have 1 in the unit digit because of 1x1 and there will not number carried to 4+4 so 8

you can check it with 21 if you want

21x21 = 441

441 x 441 = 194481
LGTCH
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Re: Math Question

by iikarthik » Mon Jan 12, 2009 9:25 pm
logitech wrote:
Sprite_TM wrote:okay,

can someone tell me an easy way to find the hundredth digit in (321)^4 without doing crazy calculations?
321 x 321 = blablabla 41

blablabla 41 x blablabla 41 = will have 1 in the unit digit because of 1x1 and there will not number carried to 4+4 so 8

you can check it with 21 if you want

21x21 = 441

441 x 441 = 194481
Hi Correct me if i am wrong.

The question asks for the hundredth digit,which should be the third one from right
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by awesomeusername » Tue Jan 13, 2009 1:35 pm
If my mind serves me correctly, the hundredth digit is on the right side of the decimal. So in 123.456, the hundredth digit is 5. The hundreds is 1. So the hundredth digit in your question would be 0.
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by logitech » Tue Jan 13, 2009 5:28 pm
you guys are right.

It should be Hundreds
LGTCH
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