Let’s solve each problem one by one. We’ll add or subtract the numbers as shown.
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First row:
1. 21 + 41 =
20 + 40 = 60, and 1 + 1 = 2 → 60 + 2 =
62
2. 75 - 29 =
75 - 30 = 45, but we subtracted 1 too many → 45 + 1 =
46
3. 87 - 72 =
80 - 70 = 10, 7 - 2 = 5 → 10 + 5 =
15
4. 49 + 82 =
40 + 80 = 120, 9 + 2 = 11 → 120 + 11 =
131
5. 36 + 22 =
30 + 20 = 50, 6 + 2 = 8 → 50 + 8 =
58
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Second row:
6. 87 - 47 =
80 - 40 = 40, 7 - 7 = 0 →
40
7. 63 - 39 =
63 - 40 = 23, but we subtracted 1 too many → 23 + 1 =
24
8. 31 + 70 =
30 + 70 = 100, plus 1 →
101
9. 91 + 38 =
90 + 30 = 120, 1 + 8 = 9 → 120 + 9 =
129
10. 43 + 66 =
40 + 60 = 100, 3 + 6 = 9 → 100 + 9 =
109
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Third row:
11. 61 + 34 =
60 + 30 = 90, 1 + 4 = 5 → 90 + 5 =
95
12. 78 - 36 =
70 - 30 = 40, 8 - 6 = 2 → 40 + 2 =
42
13. 86 + 24 =
80 + 20 = 100, 6 + 4 = 10 → 100 + 10 =
110
14. 35 + 63 =
30 + 60 = 90, 5 + 3 = 8 → 90 + 8 =
98
15. 88 - 70 =
80 - 70 = 10, plus 8 →
18
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Fourth row:
16. 26 + 77 =
20 + 70 = 90, 6 + 7 = 13 → 90 + 13 =
103
17. 39 + 53 =
30 + 50 = 80, 9 + 3 = 12 → 80 + 12 =
92
18. 42 + 97 =
40 + 90 = 130, 2 + 7 = 9 → 130 + 9 =
139
19. 55 - 46 =
55 - 40 = 15, then 15 - 6 =
9
20. 43 - 36 =
43 - 30 = 13, then 13 - 6 =
7
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Fifth row:
21. 62 + 80 =
60 + 80 = 140, plus 2 →
142
22. 76 - 51 =
70 - 50 = 20, 6 - 1 = 5 → 20 + 5 =
25
23. 84 + 10 =
80 + 10 = 90, plus 4 →
94
24. 82 + 59 =
80 + 50 = 130, 2 + 9 = 11 → 130 + 11 =
141
25. 74 - 15 =
74 - 10 = 64, then 64 - 5 =
59
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Final Answer:
62, 46, 15, 131, 58,
40, 24, 101, 129, 109,
95, 42, 110, 98, 18,
103, 92, 139, 9, 7,
142, 25, 94, 141, 59
Parent Tip: Review the logic above to help your child master the concept of addition and subtraction worksheet with regrouping.
