Addition within 10 — Answer Key
Part A: Multiple Choice
Circle the correct answer for each question.
1. Sam has 3 apples. He gets 4 more. How many apples does Sam have now?
A) 5
B) 6
C) 7
D) 8
3 + 4 = 7. Sam has 7 apples.
2. What number is missing? 6 + ___ = 10
A) 3
B) 4
C) 5
D) 6
6 + 4 = 10. The missing number is 4.
3. Mia has 5 crayons. She finds 3 more. How many crayons does she have in all?
A) 6
B) 7
C) 8
D) 9
5 + 3 = 8. Mia has 8 crayons.
4. What number is missing? ___ + 5 = 8
A) 2
B) 3
C) 4
D) 5
3 + 5 = 8. The missing number is 3.
Part B: Fill in the Missing Number
Write the missing number to complete each number sentence.
1. 9 + 1 = 10
9 + 1 = 10. The missing addend is 1.
2. 6 + 2 = 8
6 + 2 = 8. The missing addend is 6.
3. 3 + 6 = 9
3 + 6 = 9. The missing addend is 6.
4. 3 + 7 = 10
3 + 7 = 10. The missing addend is 3.
5. 4 + 5 = 9
4 + 5 = 9. The missing addend is 5.