Addition Table for 15
Each row adds 15 to numbers 1 through 12. Addition tables help build number sense and make mental math faster.
Adding 15 flips parity: every even grows into an odd and every odd into an even — 4 + 15 = 19. The nearest round ten is 20, just 5 away: 15 + 5 = 20. Every fact runs backward for free: from 15 + 6 = 21 comes the subtraction fact 21 − 15 = 6.
| Addend | Sum |
|---|---|
| 15 + 1 | 16 |
| 15 + 2 | 17 |
| 15 + 3 | 18 |
| 15 + 4 | 19 |
| 15 + 5 | 20 |
| 15 + 6 | 21 |
| 15 + 7 | 22 |
| 15 + 8 | 23 |
| 15 + 9 | 24 |
| 15 + 10 | 25 |
| 15 + 11 | 26 |
| 15 + 12 | 27 |
Frequently asked questions
What are the addition facts for 15?
Adding 15 to each number 1 through 12 gives every fact above, from 15 + 1 = 16 up to 15 + 12 = 27.
What is 15 + 7?
15 + 7 = 22.
What is the fastest way to add 15 mentally?
Split 15 into tens and ones, add the tens first, then the ones. For example 15 + 6 = (15 + 5) + 1 = 20 + 1 = 21.