Divide the numerator of the fraction by the denominator, using long division if necessary, to get a decimal fraction. Move the decimal point two places to the right and append a percent symbol for a percentage.
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Because that it s harder to work out percentages than fractions and decimals
They can both be converted into decimals and from there into fractions or percentages.
Fractions can be converted to decimals, percentages or mixed numbers.
They're all numbers.
Decimals and percentages are easier to compare than fractions - particularly if they are unlike fractions. That does not explain why percentages are required when we have decimal number and there is no good answer to that!