Let's solve each addition problem step by step:
---
1. 25 + 15 = 40
Break it down: 25 + 10 = 35, then 35 + 5 = 40
2. 31 + 8 = 39
31 + 8 = 39 (add the ones: 1 + 8 = 9, carry over nothing)
3. 10 + 20 = 30
10 + 20 = 30 (simple tens addition)
4. 17 + 10 = 27
17 + 10 = 27 (just add 10 to 17)
5. 9 + 12 = 21
9 + 12 = 21 (9 + 10 = 19, 19 + 2 = 21)
6. 22 + 11 = 33
22 + 11 = 33 (20 + 10 = 30, 2 + 1 = 3 → 30 + 3 = 33)
7. 47 + 14 = 61
47 + 10 = 57, 57 + 4 = 61
8. 70 + 13 = 83
70 + 10 = 80, 80 + 3 = 83
9. 22 + 40 = 62
22 + 40 = 62 (add tens: 20 + 40 = 60, plus 2 = 62)
10. 13 + 10 = 23
13 + 10 = 23
11. 21 + 9 = 30
21 + 9 = 30 (21 + 9 = 30, because 1 + 9 = 10, so carry over 1 → 2 + 1 = 3)
12. 22 + 31 = 53
22 + 30 = 52, 52 + 1 = 53
13. 40 + 20 = 60
40 + 20 = 60 (easy tens addition)
14. 25 + 10 = 35
25 + 10 = 35
15. 15 + 15 = 30
15 + 15 = 30 (double 15)
16. 26 + 9 = 35
26 + 9 = 35 (26 + 4 = 30, 30 + 5 = 35)
17. 16 + 35 = 51
16 + 30 = 46, 46 + 5 = 51
18. 30 + 28 = 58
30 + 20 = 50, 50 + 8 = 58
19. 25 + 45 = 70
25 + 45 = 70 (20 + 40 = 60, 5 + 5 = 10, total = 70)
20. 52 + 32 = 84
50 + 30 = 80, 2 + 2 = 4, so 80 + 4 = 84
---
✔ Final Answers:
1. 40
2. 39
3. 30
4. 27
5. 21
6. 33
7. 61
8. 83
9. 62
10. 23
11. 30
12. 53
13. 60
14. 35
15. 30
16. 35
17. 51
18. 58
19. 70
20. 84
Let me know if you'd like this formatted for printing or explained in a different way!
Parent Tip: Review the logic above to help your child master the concept of addition subtraction multiplication division worksheet for 2nd grade.
