Let’s solve each addition problem step by step. Remember, when adding two-digit numbers, we start from the right (ones place), and if the sum is 10 or more, we “regroup” — that means we carry over the tens digit to the next column.
We’ll go row by row, left to right.
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Row 1:
1.
37 + 39
Ones: 7 + 9 = 16 → write down 6, carry 1
Tens: 3 + 3 + 1 (carry) = 7
→
76
2.
59 + 25
Ones: 9 + 5 = 14 → write down 4, carry 1
Tens: 5 + 2 + 1 = 8
→
84
3.
26 + 45
Ones: 6 + 5 = 11 → write down 1, carry 1
Tens: 2 + 4 + 1 = 7
→
71
4.
43 + 28
Ones: 3 + 8 = 11 → write down 1, carry 1
Tens: 4 + 2 + 1 = 7
→
71
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Row 2:
5.
56 + 35
Ones: 6 + 5 = 11 → write down 1, carry 1
Tens: 5 + 3 + 1 = 9
→
91
6.
78 + 39
Ones: 8 + 9 = 17 → write down 7, carry 1
Tens: 7 + 3 + 1 = 11 → write down 11
→
117
7.
66 + 19
Ones: 6 + 9 = 15 → write down 5, carry 1
Tens: 6 + 1 + 1 = 8
→
85
8.
35 + 86
Ones: 5 + 6 = 11 → write down 1, carry 1
Tens: 3 + 8 + 1 = 12 → write down 12
→
121
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Row 3:
9.
48 + 99
Ones: 8 + 9 = 17 → write down 7, carry 1
Tens: 4 + 9 + 1 = 14 → write down 14
→
147
10.
17 + 18
Ones: 7 + 8 = 15 → write down 5, carry 1
Tens: 1 + 1 + 1 = 3
→
35
11.
35 + 56
Ones: 5 + 6 = 11 → write down 1, carry 1
Tens: 3 + 5 + 1 = 9
→
91
12.
58 + 42
Ones: 8 + 2 = 10 → write down 0, carry 1
Tens: 5 + 4 + 1 = 10 → write down 10
→
100
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Row 4:
13.
45 + 49
Ones: 5 + 9 = 14 → write down 4, carry 1
Tens: 4 + 4 + 1 = 9
→
94
14.
25 + 36
Ones: 5 + 6 = 11 → write down 1, carry 1
Tens: 2 + 3 + 1 = 6
→
61
15.
62 + 24
Ones: 2 + 4 = 6 → no carry
Tens: 6 + 2 = 8
→
86
16.
24 + 18
Ones: 4 + 8 = 12 → write down 2, carry 1
Tens: 2 + 1 + 1 = 4
→
42
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Row 5:
17.
28 + 63
Ones: 8 + 3 = 11 → write down 1, carry 1
Tens: 2 + 6 + 1 = 9
→
91
18.
48 + 16
Ones: 8 + 6 = 14 → write down 4, carry 1
Tens: 4 + 1 + 1 = 6
→
64
19.
55 + 29
Ones: 5 + 9 = 14 → write down 4, carry 1
Tens: 5 + 2 + 1 = 8
→
84
20.
47 + 35
Ones: 7 + 5 = 12 → write down 2, carry 1
Tens: 4 + 3 + 1 = 8
→
82
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Final Answer:
76, 84, 71, 71,
91, 117, 85, 121,
147, 35, 91, 100,
94, 61, 86, 42,
91, 64, 84, 82
Parent Tip: Review the logic above to help your child master the concept of regrouping addition worksheet.
