Let's solve each of the
double-digit addition problems step by step. We'll add the numbers column by column, starting from the right (ones place), and carry over if needed.
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✔ Step-by-step Solutions:
1.
45 + 98
- 5 + 8 = 13 → write 3, carry 1
- 4 + 9 + 1 = 14
→
143
2.
12 + 33
- 2 + 3 = 5
- 1 + 3 = 4
→
45
3.
52 + 28
- 2 + 8 = 10 → write 0, carry 1
- 5 + 2 + 1 = 8
→
80
4.
19 + 66
- 9 + 6 = 15 → write 5, carry 1
- 1 + 6 + 1 = 8
→
85
5.
47 + 39
- 7 + 9 = 16 → write 6, carry 1
- 4 + 3 + 1 = 8
→
86
6.
91 + 78
- 1 + 8 = 9
- 9 + 7 = 16
→
169
7.
21 + 89
- 1 + 9 = 10 → write 0, carry 1
- 2 + 8 + 1 = 11
→
110
8.
15 + 55
- 5 + 5 = 10 → write 0, carry 1
- 1 + 5 + 1 = 7
→
70
9.
67 + 23
- 7 + 3 = 10 → write 0, carry 1
- 6 + 2 + 1 = 9
→
90
10.
27 + 21
- 7 + 1 = 8
- 2 + 2 = 4
→
48
11.
55 + 79
- 5 + 9 = 14 → write 4, carry 1
- 5 + 7 + 1 = 13
→
134
12.
84 + 14
- 4 + 4 = 8
- 8 + 1 = 9
→
98
13.
46 + 46
- 6 + 6 = 12 → write 2, carry 1
- 4 + 4 + 1 = 9
→
92
14.
93 + 95
- 3 + 5 = 8
- 9 + 9 = 18
→
188
15.
88 + 55
- 8 + 5 = 13 → write 3, carry 1
- 8 + 5 + 1 = 14
→
143
16.
22 + 47
- 2 + 7 = 9
- 2 + 4 = 6
→
69
17.
47 + 13
- 7 + 3 = 10 → write 0, carry 1
- 4 + 1 + 1 = 6
→
60
18.
52 + 36
- 2 + 6 = 8
- 5 + 3 = 8
→
88
19.
87 + 31
- 7 + 1 = 8
- 8 + 3 = 11
→
118
20.
76 + 39
- 6 + 9 = 15 → write 5, carry 1
- 7 + 3 + 1 = 11
→
115
21.
37 + 67
- 7 + 7 = 14 → write 4, carry 1
- 3 + 6 + 1 = 10
→
104
22.
19 + 29
- 9 + 9 = 18 → write 8, carry 1
- 1 + 2 + 1 = 4
→
48
23.
41 + 51
- 1 + 1 = 2
- 4 + 5 = 9
→
92
24.
74 + 38
- 4 + 8 = 12 → write 2, carry 1
- 7 + 3 + 1 = 11
→
112
25.
58 + 95
- 8 + 5 = 13 → write 3, carry 1
- 5 + 9 + 1 = 15
→
153
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✔ Final Answers:
| # | Sum |
|---|-----|
| 1 | 143 |
| 2 | 45 |
| 3 | 80 |
| 4 | 85 |
| 5 | 86 |
| 6 | 169 |
| 7 | 110 |
| 8 | 70 |
| 9 | 90 |
|10 | 48 |
|11 | 134 |
|12 | 98 |
|13 | 92 |
|14 | 188 |
|15 | 143 |
|16 | 69 |
|17 | 60 |
|18 | 88 |
|19 | 118 |
|20 | 115 |
|21 | 104 |
|22 | 48 |
|23 | 92 |
|24 | 112 |
|25 | 153 |
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📝 Explanation:
- Always start adding from the
rightmost digit (ones place).
- If the sum in a column is
10 or more,
carry over the tens digit to the next column.
- Add the carried digit to the next column’s sum.
This method ensures accurate results for double-digit addition.
Let me know if you'd like this as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of addition worksheet double digit with.
