Pearson Edexcel GCSE (9-1) Mathematics study guide
Fractions, decimals and percentages Study Guide
Review study guide for Fractions, decimals and percentages in Edexcel Mathematics.
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Fractions, decimals and percentages
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Fractions and percentages as operators
A fraction or percentage can act as an operator on a quantity: it tells you what part of the quantity to calculate. Multiply the quantity by the fraction, or convert the percentage to a decimal or fraction before multiplying. For example, 3
A fraction or percentage can act as an operator on a quantity: it tells you what part of the quantity to calculate. Multiply the quantity by the fraction, or convert the percentage to a decimal or fraction before multiplying. For example, 3/5 of 40 is 3/5 × 40 = 24, while 30% of 50 is 0.30 × 50 = 15.
Fractions in ratio problems
A ratio divides a quantity into equal-sized parts. Add the ratio terms to find the total number of parts, then divide the known total or difference by the corresponding number of parts. Use the resulting part size to calculate the required
A ratio divides a quantity into equal-sized parts. Add the ratio terms to find the total number of parts, then divide the known total or difference by the corresponding number of parts. Use the resulting part size to calculate the required amount. A share as a fraction of the whole can usually be written as its ratio part over the sum of all ratio parts, then simplified if necessary.
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