Subtraction Table for 18
Each row subtracts numbers 1 through 12 from 18. Subtraction is the inverse of addition and appears in change-making, scores, and measurements.
Every difference here stays whole and non-negative — the smallest is 18 − 12 = 6. Subtract an even number and parity survives; subtract an odd and it flips: 18 − 3 = 15. Taking away 10 moves only the tens digit: 18 − 10 = 8, and nothing else in the number moves. Read the difference column bottom-up and it climbs, one step at a time, back to 17 — a countdown fully reversed.
| Subtrahend | Difference |
|---|---|
| 18 − 1 | 17 |
| 18 − 2 | 16 |
| 18 − 3 | 15 |
| 18 − 4 | 14 |
| 18 − 5 | 13 |
| 18 − 6 | 12 |
| 18 − 7 | 11 |
| 18 − 8 | 10 |
| 18 − 9 | 9 |
| 18 − 10 | 8 |
| 18 − 11 | 7 |
| 18 − 12 | 6 |
Frequently asked questions
What is 18 − 4?
18 − 4 = 14.
What does the difference column mean?
The difference is the result after subtracting — here, the second number in each row, such as 18 − 2 = 16.
Is subtraction commutative?
No — swapping the order changes the result: 18 − 3 = 15, but 3 − 18 = -15. That is why reading the row direction matters.