Sure! Let’s solve each double-digit addition problem step by step. Since these are Grade 1 level problems, we’ll use simple addition — adding the tens and ones separately (or just counting up) without carrying over (since none of these require regrouping).
---
Problem 1:
15 + 10
- Add the tens: 10 + 10 = 20
- Add the ones: 5 + 0 = 5
- Total:
25
✔ Answer:
25
---
Problem 2:
13 + 11
- Tens: 10 + 10 = 20
- Ones: 3 + 1 = 4
- Total:
24
✔ Answer:
24
---
Problem 3:
12 + 10
- Tens: 10 + 10 = 20
- Ones: 2 + 0 = 2
- Total:
22
✔ Answer:
22
---
Problem 4:
14 + 11
- Tens: 10 + 10 = 20
- Ones: 4 + 1 = 5
- Total:
25
✔ Answer:
25
---
Problem 5:
16 + 13
- Tens: 10 + 10 = 20
- Ones: 6 + 3 = 9
- Total:
29
✔ Answer:
29
---
Problem 6:
15 + 12
- Tens: 10 + 10 = 20
- Ones: 5 + 2 = 7
- Total:
27
✔ Answer:
27
---
Problem 7:
18 + 11
- Tens: 10 + 10 = 20
- Ones: 8 + 1 = 9
- Total:
29
✔ Answer:
29
---
Problem 8:
16 + 14
- Tens: 10 + 10 = 20
- Ones: 6 + 4 = 10 → So total becomes 20 + 10 =
30
✔ Answer:
30
*(Note: This is the only one where the ones add to 10, so you can think of it as “20 + 10 = 30”)*
---
Problem 9:
15 + 15
- Tens: 10 + 10 = 20
- Ones: 5 + 5 = 10 → So total = 20 + 10 =
30
✔ Answer:
30
---
##
✔ Final Answers (in order):
1.
25
2.
24
3.
22
4.
25
5.
29
6.
27
7.
29
8.
30
9.
30
---
## 💡 Teaching Tip for Grade 1:
For young learners, you can use
place value blocks or
number lines to visualize the addition. For example:
- For
15 + 10: Start at 15, jump forward 10 spaces → land on 25.
- Or break numbers: 15 = 10 + 5; 10 = 10 + 0 → (10+10) + (5+0) = 20 + 5 = 25.
This builds a strong foundation for future math concepts like regrouping!
Let me know if you’d like a printable answer sheet or visual aids for these problems 😊
Parent Tip: Review the logic above to help your child master the concept of basic skill math worksheet.
