Addition facts to 20
Grade 2 and up
The 100 facts from 1 + 1 to 10 + 10 cover every sum up to 20. Doubles, near doubles and making a ten take most of the work out of them.
How to learn them
- Doubles are quick: 6 + 6 is 12.
- Near doubles: 6 + 7 is a double plus 1.
- Make a ten: 9 + 5 is the same as 10 + 4.
Example: 8 + 5 = ? 8 needs 2 more to make 10. Take 2 from the 5. That leaves 3. 10 + 3 is 13. Answer: 13.
Try three
3 + 1 = ?
Tap an answer to try it.
6 + 1 = ?
Tap an answer to try it.
9 + 6 = ?
Tap an answer to try it.
Addition chart
Find a row and a column. The answer is where they meet.
| + | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
Questions parents ask
- What is the fastest way to learn addition facts to 20?
- Learn the doubles first, then use them for near doubles (6 + 7 is 6 + 6 plus 1), then practise making a ten (9 + 5 is 10 + 4). A few facts a day beats a long session.
- How many addition facts are there?
- There are 100 facts when both numbers run from 1 to 10. Because 3 + 8 and 8 + 3 have the same answer, a child really learns far fewer than 100 separate ideas.
More sets: all math facts practice. Math facts practice is not a report-card mark; it shows what a child knows by heart.
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