Cambridge O Level Mathematics (Syllabus D) · Syllabus 4024 · Number
Fractions, Decimals and Percentages
What is Fractions, Decimals and Percentages?
Three interchangeable ways of writing the same rational quantity: a fraction as a ratio of two integers, a decimal as a place-value expansion, and a percentage as a number of hundredths. Every rational number has a terminating or recurring decimal expansion, and every terminating or recurring decimal can be converted back to an exact fraction.
This definition is part of the Number chapter in Cambridge O Level Mathematics (Syllabus D).
Fractions, Decimals and Percentages in context
Fractions, decimals and percentages are one number wearing three coats. Choose the coat that suits the job: fractions for exact work and cancelling, decimals for ordering and calculator entry, percentages for comparison and change. The conversions themselves are only three operations — divide, use place value, and multiply or divide by 100 — and every one of them is reversible.