Multiples
Normally we count by ones like this: 1, 2, 3, 4, 5, 6, 7, 8, 9, etc.
But, we can also count by other numbers. For instance, we can count by twos like this: 2, 4, 6, 8, 10, 12, 14, 16, 18, etc. The number in this list are the first nine multiples of two.
We could also count by threes like this: 3, 6, 9, 12, 15, 18, 21, etc. This list contains the first seven multiples of three
In each case we could go on as long as we like.
When we count by a number we start with that number and then keep adding that number. Study this table to see how counting by three works:
| NUMBER | ADDITION PROBLEM | MULTIPLICATION PROBLEM |
|---|---|---|
| 3 | 3 | 3x1 |
| 6 | 3+3 | 3x2 |
| 9 | 3+3+3 | 3x3 |
| 12 | 3+3+3+3 | 3x4 |
| 15 | 3+3+3+3+3 | 3x5 |
| 18 | 3+3+3+3+3+3 | 3x6 |
| 21 | 3+3+3+3+3+3+3 | 3x7 |
| 24 | 3+3+3+3+3+3+3+3 | 3x8 |
| 27 | 3+3+3+3+3+3+3+3+3 | 3x9 |
Here are the first nine multiples of four: 4, 8, 12, 16, 20, 24, 28, 32, 36.
Here are the first nine multiples of five: 5, 10, 15, 20, 25, 30, 35, 40, 45.
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