Addition within 10 — Answer Key
Part A: Fill in the Missing Number
Write the missing number to complete each number sentence.
1. 4 + 3 = 7
To find the missing number, subtract 3 from 7: 7 - 3 = 4, so 4 + 3 = 7.
2. 5 + 4 = 9
To find the missing number, subtract 5 from 9: 9 - 5 = 4, so 5 + 4 = 9.
3. 4 + 4 = 8
To find the missing number, subtract 4 from 8: 8 - 4 = 4, so 4 + 4 = 8.
4. 6 + 4 = 10
To find the missing number, subtract 6 from 10: 10 - 6 = 4, so 6 + 4 = 10.
5. 7 + 2 = 9
To find the missing number, subtract 2 from 9: 9 - 2 = 7, so 7 + 2 = 9.
6. 3 + 7 = 10
To find the missing number, subtract 3 from 10: 10 - 3 = 7, so 3 + 7 = 10.
7. 3 + 5 = 8
To find the missing number, subtract 5 from 8: 8 - 5 = 3, so 3 + 5 = 8.
8. 1 + 6 = 7
To find the missing number, subtract 1 from 7: 7 - 1 = 6, so 1 + 6 = 7.
9. 6 + 0 = 6
To find the missing number, subtract 0 from 6: 6 - 0 = 6, so 6 + 0 = 6.
Part B: Match the Equation to Its Answer
Draw a line to match each addition problem to its answer.
1.
2 + 6
→ 8
10
1 + 9
→ 10
8
4 + 5
→ 9
10
3 + 7
→ 10
9
Match each addition to its sum: 2 + 6 = 8, 1 + 9 = 10, 4 + 5 = 9, 3 + 7 = 10.