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Mathematics 8 Online
OpenStudy (anonymous):

If you help me I will fan you and give you a medal

OpenStudy (anonymous):

OpenStudy (turingtest):

Do you have any practice with turning repeating decimals into fractions, or is this your first time trying?

OpenStudy (anonymous):

its my first time

OpenStudy (turingtest):

We can do this with a cool little trick: Let x = the repeating decimal\[x=1.\overline{04}\]now, what would 100x be?

OpenStudy (anonymous):

idk

OpenStudy (turingtest):

how about if I rewrite this as\[1.04040404...\]what is that number multiplied by 100?

OpenStudy (anonymous):

104.0404

OpenStudy (turingtest):

good, so that is 100x so we have\[x=1.040404...\]and\[100x=104.040404...\] now notice if we subtract x from 100x, the repeating decimal part will disappear!

OpenStudy (turingtest):

so what is\[104.040404...\\ - 1.040404...\]?

OpenStudy (anonymous):

103

OpenStudy (turingtest):

good, and how many x is that?

OpenStudy (anonymous):

um 103?

OpenStudy (turingtest):

remember that \[100x=104.0404...\]and\[x=1.0404...\]

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