Asked by rian
.1515 repeat, I get 303/2000 and divide it to get the .1515 repeat, but in my book, it says the answer is 5/33, how is that
Answers
Answered by
Steve
if
n = .15151515...
100n = 15.15151515...
so,
99n = 15
n = 15/99 = 5/33
Any group of n digits which repeats is the string of digits divided by a string of 9's of the same length:
.333333 = 3/9
.15151515 = 15/99
.67836783... = 6783/9999
and so on
n = .15151515...
100n = 15.15151515...
so,
99n = 15
n = 15/99 = 5/33
Any group of n digits which repeats is the string of digits divided by a string of 9's of the same length:
.333333 = 3/9
.15151515 = 15/99
.67836783... = 6783/9999
and so on
Answered by
rian
how do you get the 99n? im sorry but I am really confused
Answered by
Steve
the usual way
subtract n from 100n to get 99n
look above to see that
15.151515...
-0.151515...
= 15
subtract n from 100n to get 99n
look above to see that
15.151515...
-0.151515...
= 15
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