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0.121212 = 121212/1000000 = 30303/250000

If 0.121212 is meant to indicate 0.12 recurring, then

Let D = 0.12..

100*D = 12.12..

Subtracting the first from the second, 99*D = 12

so that D = 12/99 = 4/33

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Q: How do you change 0.121212 to fraction?
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