- #1

- 655

- 0

x = 0.91919191

then you go 100x = 91.919191

100x - x = 91

When do you use this? It's in conjuction with somthing else... looked in my text book cant find it.

Thanks

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- Thread starter thomas49th
- Start date

- #1

- 655

- 0

x = 0.91919191

then you go 100x = 91.919191

100x - x = 91

When do you use this? It's in conjuction with somthing else... looked in my text book cant find it.

Thanks

- #2

- 486

- 1

- #3

arildno

Science Advisor

Homework Helper

Gold Member

Dearly Missed

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It is a wrong question; the technique is never "used"; rather, it illustrates how you may rewrite a periodic decimal as a fraction.

That is, the technique amounts to a constructive PROOF of a certain mathematical proposition:

namely that any periodic decimal can be written as a fraction between two natural numbers, i.e a periodic decimal is necessarily a rational number.

- #4

Gib Z

Homework Helper

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100x - x=99x=91

x=91/99

Thats why its used, to get urself a fraction.

x=91/99

Thats why its used, to get urself a fraction.

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