The easiest way is to write multiply by 10/10 until you get rid of the decimal point.
0.234 = 2.34/10 = 23.4/100 = 234/1000
This can be simplified by looking at the factors.
234 = 2 * 3 * 3 * 13
1000 = 2 * 2 * 2 * 5 * 5 * 5
234/1000 = (2*3*3*13)/(2*2*2*5*5*5) = (3*3*13)/(2*2*5*5*5) = 117/500
By eliminating all common factors, you know you've simplified the fraction as much as possible.
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Every fraction is an equivalent fraction: each fraction in decimal form has an equivalent rational fraction as well as an equivalent percentage fraction.
A fraction that has a different sign to the first fraction.
Divide the fraction by 100, and you will get the percentage of a fraction.
Or both. That's a complex fraction.
The number below the fraction bar in a fraction is the denominator. The number above the fraction bar is the numerator.