Addition within 10 — Answer Key
Part A: Multiple Choice
Circle the correct answer for each question.
1. Which two numbers add up to 9?
A) 3 + 5
B) 4 + 5
C) 2 + 6
D) 1 + 7
B is correct because 4 + 5 = 9, while the other choices equal 8.
2. Which pair of numbers makes 10?
A) 3 + 6
B) 5 + 4
C) 7 + 3
D) 2 + 7
C is correct because 7 + 3 = 10, while the other choices equal 9.
3. Sam has 4 apples. He picks 3 more. How many apples does Sam have now?
A) 6
B) 7
C) 8
D) 5
B is correct because 4 + 3 = 7 apples in all.
4. Which addition sentence equals 8?
A) 2 + 5
B) 3 + 4
C) 6 + 2
D) 4 + 3
C is correct because 6 + 2 = 8, while the other choices equal 7.
Part B: Fill in the Missing Number
Find the missing number. Write it on the line.
1. 4 + 6 = 10
To find the missing number, subtract 6 from 10: 10 - 6 = 4, so 4 + 6 = 10.
2. 4 + 3 = 7
To find the missing number, subtract 4 from 7: 7 - 4 = 3, so 4 + 3 = 7.
3. 3 + 5 = 8
To find the missing number, subtract 5 from 8: 8 - 5 = 3, so 3 + 5 = 8.
4. 2 + 7 = 9
To find the missing number, subtract 2 from 9: 9 - 2 = 7, so 2 + 7 = 9.
5. 7 + 3 = 10
To find the missing number, subtract 3 from 10: 10 - 3 = 7, so 7 + 3 = 10.