Addition Within 10 — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 5 + 4 = 9
4 + 5 = 9. From 4, counting up 5 steps reaches 9. You can also think: 4 + 4 is 8, so one more makes 9.
2. 6 + 2 = 8
5 + 3 = 8. The missing part is 5 because 3 and 5 together build up to 8.
3. 3 + 7 = 10
6 + 2 = 8. Hold 6 in your head and take two counting hops: 7, then 8.
4. 3 + 3 = 6
1 + 6 = 7. If 1 is already in the group, you need 6 more to reach a full 7.
5. 4 + 1 = 5
0 + 4 = 4. When the total matches the other part exactly, the missing part must be zero — nothing extra was added.
6. 8 + 2 = 10
3 + 7 = 10. 3 and 7 are a make-ten pair that always fills the ten-frame.
7. 5 + 2 = 7
5 + 1 = 6. Just one more hop from 5 lands on 6.
8. 4 + 6 = 10
3 + 2 = 5. Starting from 2, three more jumps get you to 5.
9. 1 + 5 = 6
2 + 2 = 4. This is a doubles fact — two pairs of 2 make 4, like two ears and two eyes.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
2 + 5
→ 7
4
6 + 3
→ 9
7
1 + 3
→ 4
10
4 + 6
→ 10
9
Add each pair and draw a line to the right total: 5 + 4 is 9; 3 + 3 is the double 6; 1 + 9 makes 10; and 2 + 5 equals 7.