MyMathKidK-8 Curriculum

Grade 1 Number Bonds: Bonds of 20

Master all the ways to make 20

What You'll Learn

Know all pairs that make 20 (1+19, 2+18, etc.)
Use bonds of 20 for mental math
See patterns in making 20

📖The Power of 20

Just like Making 10, Making 20 is very useful! 1+19=20, 2+18=20, 3+17=20, and so on. Notice the pattern: as one number goes up, the other goes down!

💡

To find what makes 20 with any number, first think about making 10, then add 10 more. For example: 7+3=10, so 7+13=20!

Worked examples

Real problems from the practice worksheets, solved one step at a time.

Example 1
14 + 6 = ?
1. A number bond joins two parts to make a whole. Here the two parts are 14 and 6.
2. To find the whole, put the parts together: 14 + 6.
3. So the whole is 20.
Answer: 20
Example 2
? + 16 = 20
1. A number bond joins two parts to make a whole. The whole is 20 and one part is 16.
2. To find the missing part, take the known part away from the whole: 20 − 16.
3. So the missing part is 4.
Answer: 4
Example 3
15 + ? = 20
1. A number bond joins two parts to make a whole. The whole is 20 and one part is 15.
2. To find the missing part, take the known part away from the whole: 20 − 15.
3. So the missing part is 5.
Answer: 5

Practice Worksheets

Bonds of 20 (Set A)

Learn all the ways to make 20

Bonds of 20 (Set B)

Practice making 20 different ways

Bonds of 20 (Set C)

More bonds of 20 practice

Bonds of 20 (Set D)

Keep practicing bonds of 20

Bonds of 20 (Set E)

Master bonds of 20

Number Bonds Within 20