Here are all the
Tens Complements:
| Number |
Tens Complement |
Why? Because: |
| 0 |
10 |
0 + 10 = 10 |
| 1 |
9 |
1 + 9 = 10 |
| 2 |
8 |
2 + 8 = 10 |
| 3 |
7 |
3 + 7 = 10 |
| 4 |
6 |
4 + 6 = 10 |
| 5 |
5 |
5 + 5 = 10 |
| 6 |
4 |
6 + 4 = 10 |
| 7 |
3 |
7 + 3 = 10 |
| 8 |
2 |
8 + 2 = 10 |
| 9 |
1 |
9 + 1 = 10 |
| 10 |
0 |
10 + 0 = 10 |
But you only have to remember half the table!
If you know that 1 + 9 = 10, you should also know that 9 + 1 = 10
1 and 9 are partners!
So are 2 and 8, 3 and 7, 4 and 6 and 5 and 5
Why is this Important?
If you know your Tens Complements it makes some mental arithmetic a whole lot easier.
For example it is used in Quick Subtraction.
Practice!
You can practice by using What Makes 10?
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