Add 8: Addition Facts
| 8 + 1 = 9 |
| 8 + 2 = 10 |
| 8 + 3 = 11 |
| 8 + 4 = 12 |
| 8 + 5 = 13 |
| 8 + 6 = 14 |
| 8 + 7 = 15 |
| 8 + 8 = 16 |
| 8 + 9 = 17 |
| 8 + 10 = 18 |
| 8 + 11 = 19 |
| 8 + 12 = 20 |
Zoorithmetic https://zoorithmetic.com/
Add 8 is a short step from ten, which makes it the family where make-ten strategies pay off the most.
Counting on from 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
Each answer is 2 less than adding 10: 8 + 5 is 15 minus 2, which is 13.
Tip for the add 8 facts
Take 2 from the other number to fill the ten. For 8 + 6, the 6 gives 2 and keeps 4, so 10 + 4 = 14.
The 3 hardest facts
- 8 + 5 = 13
- 8 + 6 = 14
- 8 + 7 = 15
These need a bridge across ten. 8 + 7 is also the near double 8 + 8 = 16 minus 1.
Turnaround facts
Swapping the numbers gives the same answer, so each fact below is learned once and used twice.
- 8 + 1 = 1 + 8 = 9
- 8 + 2 = 2 + 8 = 10
- 8 + 3 = 3 + 8 = 11
- 8 + 4 = 4 + 8 = 12
- 8 + 5 = 5 + 8 = 13
- 8 + 6 = 6 + 8 = 14
- 8 + 7 = 7 + 8 = 15
- 8 + 9 = 9 + 8 = 17
- 8 + 10 = 10 + 8 = 18
- 8 + 11 = 11 + 8 = 19
- 8 + 12 = 12 + 8 = 20
Play the add 8 facts game
Untimed by default. A missed fact shows its answer and comes back later in the round.
Printable add 8 chart
One US Letter page, clear in black and white.
Quick quiz: add 8 facts
10 questions, no timer. At the end you see the score, the facts to practice and a sheet you can print.
Questions parents ask
How do I teach make ten?
Draw a ten frame with 8 dots and ask how many more fill it. The answer is 2, and the rest of the second number goes over the line.
Is 8 + 8 worth memorizing?
Yes. 8 + 8 = 16 is a double, and it anchors 8 + 7 and 8 + 9 as one less and one more.