To add and subtract numbers always begin counting from zero.
When dealing with positive numbers count to the right.
When dealing with negative numbers count to the left.
Using a number line
Sample question
Calculate: - 2 + 9 - 10 + 6
When adding or subtracting negative numbers, we must remember that when two signs appear next to each other and are different, then we subtract. When two signs are next to each other and they are the same, we add:
