Addition Within 10 — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 7 + 2 = 9
Going from 7 up to 9 is just two steps, so 7 + 2 = 9.
2. 5 + 3 = 8
To make 8 when one part is 3, the other part must be 5, because 5 + 3 = 8.
3. 2 + 8 = 10
2 needs 8 more to reach 10, since 2 and 8 are number-bond partners that make 10.
4. 1 + 6 = 7
6 is already very close to 7 — it only needs 1 more, so 1 + 6 = 7.
5. 5 + 3 = 8
Starting at 5 and adding 3 lands on 8: 5, 6, 7, 8. So 5 + 3 = 8.
6. 9 + 0 = 9
Adding zero to a number leaves it unchanged, so 9 + 0 stays 9. Zero means no change.
7. 1 + 3 = 4
From 1, three more jumps reach 4: 2, 3, 4. So 1 + 3 = 4.
8. 5 + 5 = 10
Doubles make this easy — 5 and 5 together make 10, so 5 + 5 = 10.
9. 3 + 4 = 7
Counting up from 3 by 4 — 4, 5, 6, 7 — reaches 7, which means 3 + 4 = 7.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
5 + 1
→ 6
5
3 + 2
→ 5
6
7 + 3
→ 10
8
4 + 4
→ 8
10
Each expression matches the sum of its two parts: 5 + 1 = 6, 3 + 2 = 5, 7 + 3 = 10, and 4 + 4 = 8.