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terminating decimals

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terminating decimals [#permalink] New post 08 Sep 2009, 02:36
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anybody know a shortcut to these problems. Ex: X/Y 100<x<200 Y is even (or odd or some other restrictions)

How Xs are there that has terminating decimals (ie it ends).
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Re: terminating decimals [#permalink] New post 11 Sep 2009, 10:11
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A decimal terminates if the fully reduced fractional form of the number has nothing but factors of 2's and 5's (and 1's, of course) in the denominator.

For example, the following do NOT terminate: 2/19, 2/3, 1/17, 5/11, 7/15.

The following DO terminate: 1/20, 3/5, 373/500, 12/48 (because even though 48 has a factor of 3, in fully reduced form 12/48 = 1/4, which has only 2's in the denominator).

Why does this rule work? Because 2's and 5's are the components of 10, and our decimal system is base 10. Putting terminating decimals into fractional form can be easily done: the numerator consists of the digits after the decimal, the denominator of a power of 10 with the same number of zeros as the number of digits in the numerator.

For example:
0.123 = 123/1000 (3 digits after decimal)
0.45809 = 45,809/100,000 (5 digits after decimal)
0.7 = 7/10

So if you are asked whether x/y terminates, it depends on whether factors in x cancel all (any) non-2 or non-5 factors of y from the denominator.
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Re: terminating decimals [#permalink] New post 11 Sep 2009, 16:36
well..tats a nice explanation..thankss
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Re: terminating decimals [#permalink] New post 12 Sep 2009, 16:39
esledge wrote:
A decimal terminates if the fully reduced fractional form of the number has nothing but factors of 2's and 5's (and 1's, of course) in the denominator.

For example, the following do NOT terminate: 2/19, 2/3, 1/17, 5/11, 7/15.

The following DO terminate: 1/20, 3/5, 373/500, 12/48 (because even though 48 has a factor of 3, in fully reduced form 12/48 = 1/4, which has only 2's in the denominator).

Why does this rule work? Because 2's and 5's are the components of 10, and our decimal system is base 10. Putting terminating decimals into fractional form can be easily done: the numerator consists of the digits after the decimal, the denominator of a power of 10 with the same number of zeros as the number of digits in the numerator.

For example:
0.123 = 123/1000 (3 digits after decimal)
0.45809 = 45,809/100,000 (5 digits after decimal)
0.7 = 7/10

So if you are asked whether x/y terminates, it depends on whether factors in x cancel all (any) non-2 or non-5 factors of y from the denominator.


This is good stuff. Nice explanation
Re: terminating decimals   [#permalink] 12 Sep 2009, 16:39
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