Let's solve each of the addition problems step by step, focusing on
adding up to 100 with regrouping (also known as carrying over). We'll go through each problem and explain how to add the numbers, especially when the sum of the ones place is 10 or more.
---
1. 37 + 47
- Add the ones: 7 + 7 = 14 → write down
4, carry over
1 to the tens.
- Add the tens: 3 + 4 = 7, plus the carried 1 =
8
-
Answer: 84
---
2. 29 + 33
- Ones: 9 + 3 = 12 → write
2, carry
1
- Tens: 2 + 3 = 5, plus 1 =
6
-
Answer: 62
---
3. 48 + 13
- Ones: 8 + 3 = 11 → write
1, carry
1
- Tens: 4 + 1 = 5, plus 1 =
6
-
Answer: 61
---
4. 49 + 21
- Ones: 9 + 1 = 10 → write
0, carry
1
- Tens: 4 + 2 = 6, plus 1 =
7
-
Answer: 70
---
5. 15 + 48
- Ones: 5 + 8 = 13 → write
3, carry
1
- Tens: 1 + 4 = 5, plus 1 =
6
-
Answer: 63
---
6. 56 + 29
- Ones: 6 + 9 = 15 → write
5, carry
1
- Tens: 5 + 2 = 7, plus 1 =
8
-
Answer: 85
---
7. 25 + 66
- Ones: 5 + 6 = 11 → write
1, carry
1
- Tens: 2 + 6 = 8, plus 1 =
9
-
Answer: 91
---
8. 49 + 49
- Ones: 9 + 9 = 18 → write
8, carry
1
- Tens: 4 + 4 = 8, plus 1 =
9
-
Answer: 98
---
9. 39 + 59
- Ones: 9 + 9 = 18 → write
8, carry
1
- Tens: 3 + 5 = 8, plus 1 =
9
-
Answer: 98
---
10. 12 + 48
- Ones: 2 + 8 = 10 → write
0, carry
1
- Tens: 1 + 4 = 5, plus 1 =
6
-
Answer: 60
---
11. 69 + 15
- Ones: 9 + 5 = 14 → write
4, carry
1
- Tens: 6 + 1 = 7, plus 1 =
8
-
Answer: 84
---
12. 59 + 12
- Ones: 9 + 2 = 11 → write
1, carry
1
- Tens: 5 + 1 = 6, plus 1 =
7
-
Answer: 71
---
13. 38 + 32
- Ones: 8 + 2 = 10 → write
0, carry
1
- Tens: 3 + 3 = 6, plus 1 =
7
-
Answer: 70
---
14. 29 + 38
- Ones: 9 + 8 = 17 → write
7, carry
1
- Tens: 2 + 3 = 5, plus 1 =
6
-
Answer: 67
---
15. 19 + 19
- Ones: 9 + 9 = 18 → write
8, carry
1
- Tens: 1 + 1 = 2, plus 1 =
3
-
Answer: 38
---
✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 1 | 84 |
| 2 | 62 |
| 3 | 61 |
| 4 | 70 |
| 5 | 63 |
| 6 | 85 |
| 7 | 91 |
| 8 | 98 |
| 9 | 98 |
| 10 | 60 |
| 11 | 84 |
| 12 | 71 |
| 13 | 70 |
| 14 | 67 |
| 15 | 38 |
---
✔ Key Concept: When adding two-digit numbers, always start from the
ones place. If the sum is
10 or more,
regroup (carry) 1 to the tens column.
Let me know if you'd like a printable version or visual explanation!
Parent Tip: Review the logic above to help your child master the concept of addition worksheet free second.
