Let’s solve each problem one by one. We’ll do addition and subtraction carefully, step by step.
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First row: Addition
1. 10 + 15
→ 10 + 10 = 20, then +5 more =
25
2. 44 + 36
→ 40 + 30 = 70, 4 + 6 = 10 → 70 + 10 =
80
3. 81 + 27
→ 80 + 20 = 100, 1 + 7 = 8 → 100 + 8 =
108
4. 12 + 88
→ 10 + 80 = 90, 2 + 8 = 10 → 90 + 10 =
100
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Second row: Subtraction
5. 24 - 16
→ 24 - 10 = 14, then -6 more =
8
6. 59 - 40
→ Just take away 40 from 59 →
19
7. 99 - 32
→ 99 - 30 = 69, then -2 more =
67
8. 63 - 29
→ Think: 63 - 30 = 33, but we subtracted 1 too many → add back 1 →
34
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Third row: Addition
9. 35 + 35
→ Double 35 → 30+30=60, 5+5=10 → 60+10 =
70
10. 76 + 25
→ 76 + 20 = 96, then +5 =
101
11. 13 + 52
→ 10 + 50 = 60, 3 + 2 = 5 → 60 + 5 =
65
12. 48 + 16
→ 48 + 10 = 58, then +6 =
64
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Fourth row: Subtraction
13. 92 - 18
→ 92 - 10 = 82, then -8 more =
74
14. 30 - 21
→ 30 - 20 = 10, then -1 more =
9
15. 76 - 57
→ 76 - 50 = 26, then -7 more =
19
16. 84 - 61
→ 84 - 60 = 24, then -1 more =
23
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Final Answer:
25, 80, 108, 100, 8, 19, 67, 34, 70, 101, 65, 64, 74, 9, 19, 23
Parent Tip: Review the logic above to help your child master the concept of two digit addition and subtraction worksheet for grade 1.
