Number Bonds to 20
Finding parts that make a whole number up to 20
Number Bonds to 20
Finding parts that make a whole number up to 20
Math - Grade 2-3
- 1
Complete the number bond: 8 and ___ make 20.
Count up from 8 to 20.
8 and 12 make 20 because 8 + 12 = 20. - 2
Complete the number bond: 15 and ___ make 20.
15 and 5 make 20 because 15 + 5 = 20. - 3
Write the two parts in this number bond: The whole is 18. One part is 9. What is the other part?
Think of a doubles fact.
The other part is 9 because 9 + 9 = 18. - 4
Mia has 11 blue beads and some red beads. She has 20 beads in all. How many red beads does Mia have?
Find the missing part that goes with 11 to make 20.
Mia has 9 red beads because 11 + 9 = 20. - 5
Complete the number sentence: 6 + ___ = 20.
The missing number is 14 because 6 + 14 = 20. - 6
Complete the number bond: 7 and ___ make 16.
Start at 7 and count up to 16.
7 and 9 make 16 because 7 + 9 = 16. - 7
A basket has 13 apples. Some more apples are added, and now there are 20 apples. How many apples were added?
7 apples were added because 13 + 7 = 20. - 8
List three different number bonds that make 20.
Choose a number, then find what it needs to reach 20.
Three possible number bonds are 1 and 19, 8 and 12, and 10 and 10 because each pair adds to 20. - 9
Complete the number sentence: ___ + 4 = 17.
The missing number is 13 because 13 + 4 = 17. - 10
The whole is 19. The two parts are 10 and ___. Fill in the missing part.
Use the fact that 10 plus a number is easy to count.
The missing part is 9 because 10 + 9 = 19. - 11
Sam needs 20 stickers. He already has 16 stickers. How many more stickers does he need?
Sam needs 4 more stickers because 16 + 4 = 20. - 12
Complete this fact family for the number bond 12 and 5 make 17: 12 + 5 = 17, 5 + 12 = 17, 17 - 12 = ___, and 17 - 5 = ___.
In a number bond, subtraction starts with the whole.
17 - 12 = 5, and 17 - 5 = 12. The subtraction facts use the same whole and parts. - 13
Look at the ten-frames. One ten-frame is full, and the second ten-frame has 3 counters. How many more counters are needed to make 20?
7 more counters are needed because there are 13 counters now, and 13 + 7 = 20. - 14
Complete the number bond: 14 is the whole. One part is 6. What is the other part?
Count up from 6 to 14.
The other part is 8 because 6 + 8 = 14. - 15
True or false: 9 and 11 are a number bond for 20. Explain your answer.
This is true because 9 + 11 = 20, so 9 and 11 are parts that make the whole 20.