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Understanding factors, multiples, and prime numbers is important for the CSSE maths paper. These concepts help you simplify fractions, find common denominators, and solve a wide range of number problems. Let us work through each topic carefully.
Factors of a number are whole numbers that divide into it exactly, with no remainder.
Work in pairs. Start with 1 × the number itself, then try 2, 3, 4... and stop when the pairs meet or cross.
Find all factors of 36.
| Pair | Product |
|---|---|
| 1 × 36 | 36 |
| 2 × 18 | 36 |
| 3 × 12 | 36 |
| 4 × 9 | 36 |
| 6 × 6 | 36 |
Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36 (that is 9 factors in total).
Top Tip: Factor pairs are a neat way to make sure you never miss one. Always start from 1 and work upwards.
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