Let's solve each of the addition problems on the worksheet step by step. These are all two-digit addition problems, and we'll add them vertically as shown.
---
1. 21 + 44
```
21
+44
---
65
```
Explanation:
1 + 4 = 5 (ones place)
2 + 4 = 6 (tens place)
→
65
---
2. 25 + 60
```
25
+60
---
85
```
Explanation:
5 + 0 = 5
2 + 6 = 8
→
85
---
3. 57 + 21
```
57
+21
---
78
```
Explanation:
7 + 1 = 8
5 + 2 = 7
→
78
---
4. 31 + 28
```
31
+28
---
59
```
Explanation:
1 + 8 = 9
3 + 2 = 5
→
59
---
5. 16 + 32
```
16
+32
---
48
```
Explanation:
6 + 2 = 8
1 + 3 = 4
→
48
---
6. 23 + 62
```
23
+62
---
85
```
Explanation:
3 + 2 = 5
2 + 6 = 8
→
85
---
7. 52 + 26
```
52
+26
---
78
```
Explanation:
2 + 6 = 8
5 + 2 = 7
→
78
---
8. 51 + 44
```
51
+44
---
95
```
Explanation:
1 + 4 = 5
5 + 4 = 9
→
95
---
9. 29 + 30
```
29
+30
---
59
```
Explanation:
9 + 0 = 9
2 + 3 = 5
→
59
---
10. 38 + 20
```
38
+20
---
58
```
Explanation:
8 + 0 = 8
3 + 2 = 5
→
58
---
11. 41 + 23
```
41
+23
---
64
```
Explanation:
1 + 3 = 4
4 + 2 = 6
→
64
---
12. 52 + 12
```
52
+12
---
64
```
Explanation:
2 + 2 = 4
5 + 1 = 6
→
64
---
13. 31 + 35
```
31
+35
---
66
```
Explanation:
1 + 5 = 6
3 + 3 = 6
→
66
---
14. 31 + 36
```
31
+36
---
67
```
Explanation:
1 + 6 = 7
3 + 3 = 6
→
67
---
15. 24 + 52
```
24
+52
---
76
```
Explanation:
4 + 2 = 6
2 + 5 = 7
→
76
---
16. 30 + 23
```
30
+23
---
53
```
Explanation:
0 + 3 = 3
3 + 2 = 5
→
53
---
17. 31 + 54
```
31
+54
---
85
```
Explanation:
1 + 4 = 5
3 + 5 = 8
→
85
---
18. 32 + 26
```
32
+26
---
58
```
Explanation:
2 + 6 = 8
3 + 2 = 5
→
58
---
19. 53 + 32
```
53
+32
---
85
```
Explanation:
3 + 2 = 5
5 + 3 = 8
→
85
---
20. 52 + 42
```
52
+42
---
94
```
Explanation:
2 + 2 = 4
5 + 4 = 9
→
94
---
✔ Final Answers:
1. 65
2. 85
3. 78
4. 59
5. 48
6. 85
7. 78
8. 95
9. 59
10. 58
11. 64
12. 64
13. 66
14. 67
15. 76
16. 53
17. 85
18. 58
19. 85
20. 94
---
Let me know if you'd like this formatted as a printable answer key or need help with regrouping (carrying) in any of these!
Parent Tip: Review the logic above to help your child master the concept of addition worksheet double digit with.
