Back to: Mathematics Primary 3
A factor (divisor) of a number is a number that can divide it evenly (that is, without a remainder). For example, the factors of 24 are 1, 2, 3, 4, 6, 12 and 24. A common factor of x and y is a number that is a factor of of x and also of y. For example, 6 is a common factor of 24 and 39. A prime factor is a factor that is also a prime number. For example, the prime factor of 24 are 2 and 3. When the word “divisible” appears in a question, it means “evenly divisible” or “divisible without a remainder.”
| Number | Factor |
| 1 | 1 |
| 2 | 1, 2 |
| 3 | 1, 3 |
| 4 | 1, 2, 4 |
| 5 | 1, 5 |
| 6 | 1, 2, 3, 6 |
| 7 | 1, 7 |
| 8 | 1, 2, 4, 8 |
| 9 | 1, 3, 9 |
| 10 | 1, 2, 5, 10 |
| 11 | 1, 11 |
| 12 | 1, 2, 3, 4, 6, 12 |
| 13 | 1, 13 |
| 14 | 1, 2, 7, 14 |
| 15 | 1, 3, 5, 15 |
| 16 | 1, 2, 4, 8, 16 |
| 17 | 1, 17 |
| 18 | 1, 2, 3, 6, 9, 18 |
| 19 | 1, 19 |
| 20 | 1, 2, 4, 5,10,20 |
| 21 | 1, 3, 7, 21 |
| 22 | 1, 2, 11, 22 |
| 23 | 1, 23 |
| 24 | 1, 2, 3, 4, 6, 8, 12, 24 |
| 25 | 1, 5, 25 |
Note: The only number that has one factor is one (1)
MULTIPLE
A multiple of a number is a number that is evenly divisible by it. For example, 16, 32, and 88 are multiples of 8.
14, 21, 28 are multiple of 7
E.g: what are the first 3 multiple of 2, 4, 6, 10 and 12?
2 = 2, 4, 6
4 = 4, 8, 12
6 = 6, 12, 18
10 = 10, 20, 30
12 = 12, 24, 36
Quiz
- Write out the factors of 64
- Find the LCM of 8, 12 and 16.
very helpful. thanks
Factors and multiples for JSS 2