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Shift all the numbers after the dot to being in front of the dot, put this number over the closest power of 10 greater than the given number, find and multiply the common factors together, and divide both the numerator and the denominator by this number.

For your case, this would be:

45 / 100 = ( 5 * 9 ) / ( 22 * 52 ) = 9 / ( 22 * 5) = 9 / ( 4 * 5) = 9 / 20

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14y ago
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Q: How do you find the fraction for 0.45?
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