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Is \frac{r}{s^2} a terminating decimal? 1. s = 225 2. r = 81

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Senior Manager
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Is \frac{r}{s^2} a terminating decimal? 1. s = 225 2. r = 81 [#permalink] New post 12 Jan 2010, 03:27
00:00
A
B
C
D
E

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  5% (low)

Question Stats:

67% (01:15) correct 33% (01:40) wrong based on 7 sessions
Is \frac{r}{s^2} a terminating decimal?

1. s = 225
2. r = 81
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Re: Terminating Decimal [#permalink] New post 12 Jan 2010, 04:30
C

factors of 225 square;
(5,5,5,5,3,3,3,3)
If the numerator is a multiple of 81, fraction is terminating. Else, it is non terminating.

combining statement 1 and statement 2, r/square(s) is terminating. Hence c
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Re: Terminating Decimal [#permalink] New post 15 Jan 2010, 01:11
the square of any number ending with 5, also has 5 as its unit digit. and if the unit digit of the denominator is 5 the fraction always yields a terminating decimal number. but here as the number has three as its factor the above law is not applicable


OA is C:evil:
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Re: Terminating Decimal [#permalink] New post 15 Jan 2010, 01:15
dradbeee wrote:
sorry,
the square of any number ending with 5, also has 5 as its unit digit. and if the unit digit of the denominator is 5 the fraction always yields a terminating decimal number.


OA is a :evil:

i m sorry friend.... u r forgetting 225 has 9 as a factor and 9 leaves a terminating decimal?.. no way unless it gets cancelled by numerator :twisted:
Re: Terminating Decimal   [#permalink] 15 Jan 2010, 01:15
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Is \frac{r}{s^2} a terminating decimal? 1. s = 225 2. r = 81

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