subtraction
| Taking one number or quantity away from another, or finding the difference between two quantities; it is one of the four basic operations of arithmetic. Subtraction is neither commutative: |
| a − b ≠ b − a |
| nor associative: |
| a − (b − c) ≠ (a − b) − c. |
| For example, |
| 8 − 5 ≠ 5 − 8 |
| 7 − (4 − 3) ≠ (7 − 4) − 3. |
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