Let’s solve each problem step by step. I’ll go through all 25 problems carefully and check my work.
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1. 93 + 61
3 + 1 = 4
90 + 60 = 150 → 150 + 4 =
154
2. 39 + 56
9 + 6 = 15 → write 5, carry 1
3 + 5 = 8 + 1 = 9 →
95
3. 57 - 23
7 - 3 = 4
5 - 2 = 3 →
34
4. 54 + 68
4 + 8 = 12 → write 2, carry 1
5 + 6 = 11 + 1 = 12 →
122
5. 35 - 29
5 - 9 → can’t do, borrow: 15 - 9 = 6
2 (from 3) - 2 = 0 →
6
6. 98 - 97
8 - 7 = 1
9 - 9 = 0 →
1
7. 63 + 21
3 + 1 = 4
6 + 2 = 8 →
84
8. 29 + 99
9 + 9 = 18 → write 8, carry 1
2 + 9 = 11 + 1 = 12 →
128
9. 39 + 96
9 + 6 = 15 → write 5, carry 1
3 + 9 = 12 + 1 = 13 →
135
10. 43 - 24
3 - 4 → borrow: 13 - 4 = 9
3 (from 4) - 2 = 1 →
19
11. 16 + 15
6 + 5 = 11 → write 1, carry 1
1 + 1 = 2 + 1 = 3 →
31
12. 47 + 86
7 + 6 = 13 → write 3, carry 1
4 + 8 = 12 + 1 = 13 →
133
13. 38 - 20
8 - 0 = 8
3 - 2 = 1 →
18
14. 11 + 74
1 + 4 = 5
1 + 7 = 8 →
85
15. 83 - 69
3 - 9 → borrow: 13 - 9 = 4
7 (from 8) - 6 = 1 →
14
16. 25 - 21
5 - 1 = 4
2 - 2 = 0 →
4
17. 36 - 18
6 - 8 → borrow: 16 - 8 = 8
2 (from 3) - 1 = 1 →
18
18. 10 + 72
0 + 2 = 2
1 + 7 = 8 →
82
19. 70 + 52
0 + 2 = 2
7 + 5 = 12 →
122
20. 97 - 61
7 - 1 = 6
9 - 6 = 3 →
36
21. 56 + 59
6 + 9 = 15 → write 5, carry 1
5 + 5 = 10 + 1 = 11 →
115
22. 20 + 80
0 + 0 = 0
2 + 8 = 10 →
100
23. 67 + 11
7 + 1 = 8
6 + 1 = 7 →
78
24. 69 - 62
9 - 2 = 7
6 - 6 = 0 →
7
25. 99 - 93
9 - 3 = 6
9 - 9 = 0 →
6
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Now let me double-check a few tricky ones to be sure:
- #5: 35 - 29 → yes, 35 - 30 = 5, but since we subtracted 1 too many, add back 1 → 6 ✔️
- #10: 43 - 24 → 43 - 20 = 23, then 23 - 4 = 19 ✔️
- #15: 83 - 69 → 83 - 70 = 13, then +1 = 14 ✔️
- #17: 36 - 18 → half of 36 is 18, so answer is 18 ✔️
- #24: 69 - 62 → just 7 ✔️
All look correct.
Final Answer:
1. 154
2. 95
3. 34
4. 122
5. 6
6. 1
7. 84
8. 128
9. 135
10. 19
11. 31
12. 133
13. 18
14. 85
15. 14
16. 4
17. 18
18. 82
19. 122
20. 36
21. 115
22. 100
23. 78
24. 7
25. 6
Parent Tip: Review the logic above to help your child master the concept of addition subtraction worksheet without.
