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Decimals and percentages appear throughout the CSSE maths paper, from straightforward calculations to multi-step word problems involving money, measures, and discounts. This lesson covers everything you need to know.
Decimals use a decimal point to separate whole numbers from parts of a whole.
| 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 and work column by column, just like with whole numbers.
Calculate 14.63 + 8.7
Write 8.7 as 8.70, then add:
| T | O | . | t | h | |
|---|---|---|---|---|---|
| 1 | 4 | . | 6 | 3 | |
| + | 0 | 8 | . | 7 | 0 |
| = | 2 | 3 | . | 3 | 3 |
Answer: 23.33
Ignore the decimal point, multiply as whole numbers, then put the decimal point back.
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