MyMathKidK-8 Curriculum
Common Core: 1.OA
Answer Key
Grade 1 • number-bonds • Easy

Number Bonds Within 20 (Set A)

Find missing parts in bonds to 20

10 problems

1.
?132
ans
13 + 2 = ?
2.
1511?
ans
11 + ? = 15
3.
16?7
ans
? + 7 = 16
4.
17?10
ans
? + 10 = 17
5.
?512
ans
5 + 12 = ?
6.
?216
ans
2 + 16 = ?
7.
1917?
ans
17 + ? = 19
8.
19?5
ans
? + 5 = 19
9.
20?8
ans
? + 8 = 20
10.
?911
ans
9 + 11 = ?
Math Worksheets for Kids • Worksheet #nb-within-20-a