Sure! Let’s solve each addition problem one by one. This worksheet is designed to help practice basic addition facts, especially those involving the number 9 — which is a great strategy for building mental math skills.
---
✔ Step-by-step Solutions:
1.
1 + 9 = 10
→ Adding 1 to 9 gives 10.
2.
3 + 9 = 12
→ 9 + 3 is the same as 10 + 2 = 12.
3.
9 + 4 = 13
→ Think: 9 + 1 = 10, then +3 more = 13.
4.
7 + 9 = 16
→ 9 + 7: 9 + 1 = 10, then +6 = 16.
5.
9 + 5 = 14
→ 9 + 1 = 10, then +4 = 14.
6.
9 + 6 = 15
→ 9 + 1 = 10, then +5 = 15.
7.
8 + 7 = 15
→ 8 + 2 = 10, then +5 = 15. Or just memorize 8+7=15.
8.
9 + 2 = 11
→ 9 + 1 = 10, then +1 = 11.
9.
9 + 8 = 17
→ 9 + 1 = 10, then +7 = 17.
10.
2 + 6 = 8
→ Simple addition: 2 and 6 make 8.
11.
9 + 9 = 18
→ Double 9: 9 + 9 = 18.
12.
4 + 9 = 13
→ Same as 9 + 4 = 13 (commutative property).
13.
9 + 0 = 9
→ Any number + 0 stays the same.
14.
5 + 9 = 14
→ Same as 9 + 5 = 14.
---
📝 Final Answers (to write in the boxes):
```
1 + 9 = 10 9 + 2 = 11
3 + 9 = 12 9 + 8 = 17
9 + 4 = 13 2 + 6 = 8
7 + 9 = 16 9 + 9 = 18
9 + 5 = 14 4 + 9 = 13
9 + 6 = 15 9 + 0 = 9
8 + 7 = 15 5 + 9 = 14
```
---
💡 Teaching Tip:
For problems with 9, teach the “make 10” strategy:
> Take 1 from the other number to make 9 into 10, then add the rest.
Example: 9 + 6 → take 1 from 6 → 10 + 5 = 15.
This helps kids visualize and compute faster!
Let me know if you’d like a printable version or flashcards for these facts 😊
Parent Tip: Review the logic above to help your child master the concept of addition worksheet within 20.
