Let’s solve each addition problem step by step. We’re adding two-digit numbers with regrouping (also called carrying). That means if the ones add up to 10 or more, we carry a ten to the tens column.
We’ll go row by row, left to right.
---
Row 1:
1.
57 + 28
Ones: 7 + 8 = 15 → write down 5, carry 1
Tens: 5 + 2 + 1 (carry) = 8
→
85
2.
43 + 78
Ones: 3 + 8 = 11 → write 1, carry 1
Tens: 4 + 7 + 1 = 12 → write 12
→
121
3.
25 + 89
Ones: 5 + 9 = 14 → write 4, carry 1
Tens: 2 + 8 + 1 = 11
→
114
4.
26 + 24
Ones: 6 + 4 = 10 → write 0, carry 1
Tens: 2 + 2 + 1 = 5
→
50
---
Row 2:
5.
99 + 18
Ones: 9 + 8 = 17 → write 7, carry 1
Tens: 9 + 1 + 1 = 11
→
117
6.
55 + 36
Ones: 5 + 6 = 11 → write 1, carry 1
Tens: 5 + 3 + 1 = 9
→
91
7.
46 + 54
Ones: 6 + 4 = 10 → write 0, carry 1
Tens: 4 + 5 + 1 = 10
→
100
8.
47 + 64
Ones: 7 + 4 = 11 → write 1, carry 1
Tens: 4 + 6 + 1 = 11
→
111
---
Row 3:
9.
36 + 28
Ones: 6 + 8 = 14 → write 4, carry 1
Tens: 3 + 2 + 1 = 6
→
64
10.
17 + 56
Ones: 7 + 6 = 13 → write 3, carry 1
Tens: 1 + 5 + 1 = 7
→
73
11.
45 + 39
Ones: 5 + 9 = 14 → write 4, carry 1
Tens: 4 + 3 + 1 = 8
→
84
12.
25 + 18
Ones: 5 + 8 = 13 → write 3, carry 1
Tens: 2 + 1 + 1 = 4
→
43
---
Row 4:
13.
34 + 68
Ones: 4 + 8 = 12 → write 2, carry 1
Tens: 3 + 6 + 1 = 10
→
102
14.
29 + 23
Ones: 9 + 3 = 12 → write 2, carry 1
Tens: 2 + 2 + 1 = 5
→
52
15.
18 + 26
Ones: 8 + 6 = 14 → write 4, carry 1
Tens: 1 + 2 + 1 = 4
→
44
16.
49 + 66
Ones: 9 + 6 = 15 → write 5, carry 1
Tens: 4 + 6 + 1 = 11
→
115
---
Final Answer:
85, 121, 114, 50, 117, 91, 100, 111, 64, 73, 84, 43, 102, 52, 44, 115
Parent Tip: Review the logic above to help your child master the concept of two digit addition with regrouping worksheet.
