When adding and subtracting numbers it's important to be consistent with positive and negative values. Remember that two plus signs or two minus signs make a positive. One plus and one minus make a negative.

To add and subtract numbers always begin counting from zero.

When **adding** positive numbers, count to the **right**.

When **subtracting** positive numbers, count to the **left**.

Calculate 4 - 5 - 3.

Imagine moving up and down a number line to get to the answer.

Starting from 0:

- count up to 4
- then subtract 5
- then subtract 3

The answer is -4.

- When
**adding**positive numbers, count to the**right**. - When
**subtracting**positive numbers, count to the**left**.