Number Bonds › to 20
Number Bonds to 20
Every pair that makes 20, shown visually, plus quick practice and a printable worksheet.
Number bonds to 20
20
0
20
20
1
19
20
2
18
20
3
17
20
4
16
20
5
15
20
6
14
20
7
13
20
8
12
20
9
11
20
10
10
All the pairs
| Number | Partner | Bond |
|---|---|---|
| 0 | 20 | 0 + 20 = 20 |
| 1 | 19 | 1 + 19 = 20 |
| 2 | 18 | 2 + 18 = 20 |
| 3 | 17 | 3 + 17 = 20 |
| 4 | 16 | 4 + 16 = 20 |
| 5 | 15 | 5 + 15 = 20 |
| 6 | 14 | 6 + 14 = 20 |
| 7 | 13 | 7 + 13 = 20 |
| 8 | 12 | 8 + 12 = 20 |
| 9 | 11 | 9 + 11 = 20 |
| 10 | 10 | 10 + 10 = 20 |
| 11 | 9 | 11 + 9 = 20 |
| 12 | 8 | 12 + 8 = 20 |
| 13 | 7 | 13 + 7 = 20 |
| 14 | 6 | 14 + 6 = 20 |
| 15 | 5 | 15 + 5 = 20 |
| 16 | 4 | 16 + 4 = 20 |
| 17 | 3 | 17 + 3 = 20 |
| 18 | 2 | 18 + 2 = 20 |
| 19 | 1 | 19 + 1 = 20 |
| 20 | 0 | 20 + 0 = 20 |
Tips
- Use bonds to 10: if 3 + 7 = 10, then 13 + 7 = 20.
- Double check with two ten frames side by side.
- Look for the ones digit: the ones always make 10 (except 0 + 20 and 10 + 10).
Practice
Find the missing number · 0 right · streak 0
Print a worksheet (20 questions)
Number bonds to 20 worksheet
Name: ____________________
Questions
What are number bonds to 20?
Pairs of numbers that add up to 20, such as 1 + 19.
How many number bonds to 20 are there?
21 pairs, from 0 + 20 to 20 + 0, counting each order separately.