Table of Contents
Even Numbers
Any integer that can be divided exactly by 2 is an even number.
The last digit is 0, 2, 4, 6 or 8
Example: −10, -4, 0, 8, and 32 are all even numbers
Odd Numbers
Any integer that cannot be divided exactly by 2 is an odd number.
The last digit is 1, 3, 5, 7 or 9
Example: -13, −9, 1, 5, and 27 are all odd numbers
Odd numbers are in between the even numbers.
Adding and Subtracting
When we add (or subtract) odd or even numbers the results are always:
| Operation | Result | Example |
| Even + Even | Even | 4 + 6 = 10 |
| Even + Odd | Odd | 6 + 1 = 7 |
| Odd + Even | Odd | 7 + 6 = 13 |
| Odd + Odd | Even | 1 + 5 = 6 |
The same thing happens when we subtract instead of adding.
Multiplying
When we multiply odd or even numbers the results are always:
| Operation | Result | Example |
| Even × Even | Even | 4 × 6 = 24 |
| Even × Odd | Even | 2 × 7 = 14 |
| Odd × Even | Even | 5 × 4 = 20 |
| Odd × Odd | Odd | 7 × 5 = 35 |