To convert just the decimal portion of a number, write the digits after the decimal point as the numerator over the line. Now for the denominator, write a 1 followed by as many zeros as the number of digits you wrote in the numerator. For example if the decimal was 0.070549, then the fraction would be
070549/1000000 = 70549/1000000
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you turn the decimal into a fraction then you turn the fraction into a whole number and add a percent sign
As a fraction it is simply 18/1 and as a decimal it is simply 18.0
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If you know how to turn a mixed number into a fraction and a fraction into a decimal do that then make it negative.
Fraction to decimal: Do the division. 3/4 = 3 divided by 4 = 0.75 Decimal to percent: Multiply by 100. 0.75 = 75 percent