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Decimals and percentages are closely linked to fractions. On the SET 11+ maths papers, you need to convert between all three forms, carry out calculations with decimals, and solve percentage problems. This lesson covers the key skills with plenty of worked examples.
A decimal number uses a decimal point to separate the whole-number part from the fractional part.
| Ones | . | Tenths | Hundredths | Thousandths |
|---|---|---|---|---|
| 3 | . | 4 | 7 | 5 |
The number 3.475 means 3 + 4/10 + 7/100 + 5/1000.
Line up the decimal points, fill in any missing zeros, and add or subtract as normal.
Calculate 14.6 - 7.85.
Write as 14.60 - 7.85.
Answer: 6.75
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