From Teflpedia

A percentage is a fraction expressed with a denominator of 100.[1]

Percentages are often written with a percent sign.

e.g. the number 0.55 can be expressed as "55%" read "fifty-five percent". An alternative, e.g. saying "fifty-five hundredths" is less preferred, not least because it's homophonous with "fifty five-hundredths", which is 50/500 = 0.1

Fractions are often expressed as percentages, even when the fraction could be simplified.

Test scores are often expressed as percentages.

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