Let’s solve each addition problem step by step. We’ll add the ones place first, then the tens place — and if the ones add up to 10 or more, we “regroup” (carry over) to the tens place.
---
Problem 1: 33 + 49
- Ones: 3 + 9 = 12 → write down 2, carry over 1
- Tens: 3 + 4 + 1 (carried) = 8
→
82
---
Problem 2: 45 + 36
- Ones: 5 + 6 = 11 → write down 1, carry over 1
- Tens: 4 + 3 + 1 = 8
→
81
---
Problem 3: 74 + 16
- Ones: 4 + 6 = 10 → write down 0, carry over 1
- Tens: 7 + 1 + 1 = 9
→
90
---
Problem 4: 55 + 38
- Ones: 5 + 8 = 13 → write down 3, carry over 1
- Tens: 5 + 3 + 1 = 9
→
93
---
Problem 5: 53 + 37
- Ones: 3 + 7 = 10 → write down 0, carry over 1
- Tens: 5 + 3 + 1 = 9
→
90
---
Problem 6: 27 + 67
- Ones: 7 + 7 = 14 → write down 4, carry over 1
- Tens: 2 + 6 + 1 = 9
→
94
---
Problem 7: 88 + 6
Wait — this is written as:
```
88
+ 6
-----
```
So it’s 88 + 6.
- Ones: 8 + 6 = 14 → write down 4, carry over 1
- Tens: 8 + 0 + 1 = 9
→
94
*(Note: The second number has only one digit, so we treat the tens place as 0.)*
---
Problem 8: 48 + 39
- Ones: 8 + 9 = 17 → write down 7, carry over 1
- Tens: 4 + 3 + 1 = 8
→
87
---
Problem 9: 66 + 29
- Ones: 6 + 9 = 15 → write down 5, carry over 1
- Tens: 6 + 2 + 1 = 9
→
95
---
Problem 10: 28 + 58
- Ones: 8 + 8 = 16 → write down 6, carry over 1
- Tens: 2 + 5 + 1 = 8
→
86
---
Problem 11: 77 + 19
- Ones: 7 + 9 = 16 → write down 6, carry over 1
- Tens: 7 + 1 + 1 = 9
→
96
---
Problem 12: 67 + 18
- Ones: 7 + 8 = 15 → write down 5, carry over 1
- Tens: 6 + 1 + 1 = 8
→
85
---
Problem 13: 46 + 49
- Ones: 6 + 9 = 15 → write down 5, carry over 1
- Tens: 4 + 4 + 1 = 9
→
95
---
Problem 14: 57 + 34
- Ones: 7 + 4 = 11 → write down 1, carry over 1
- Tens: 5 + 3 + 1 = 9
→
91
---
Problem 15: 65 + 29
- Ones: 5 + 9 = 14 → write down 4, carry over 1
- Tens: 6 + 2 + 1 = 9
→
94
---
Problem 16: 69 + 29
- Ones: 9 + 9 = 18 → write down 8, carry over 1
- Tens: 6 + 2 + 1 = 9
→
98
---
✔ All problems solved with regrouping where needed.
Final Answer:
82, 81, 90, 93, 90, 94, 94, 87, 95, 86, 96, 85, 95, 91, 94, 98
Parent Tip: Review the logic above to help your child master the concept of two digit addition worksheet for grade 1.
