Let's solve each of the addition and subtraction problems step by step. These are basic arithmetic operations involving two-digit numbers.
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1) 25 + 14
- Add the ones: 5 + 4 = 9
- Add the tens: 20 + 10 = 30
- Total: 30 + 9 =
39
✔ Answer: 39
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2) 68 - 12
- Subtract the ones: 8 - 2 = 6
- Subtract the tens: 60 - 10 = 50
- Total: 50 + 6 =
56
✔ Answer: 56
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3) 70 + 24
- Add the ones: 0 + 4 = 4
- Add the tens: 70 + 20 = 90
- Total: 90 + 4 =
94
✔ Answer: 94
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4) 58 - 15
- Subtract the ones: 8 - 5 = 3
- Subtract the tens: 50 - 10 = 40
- Total: 40 + 3 =
43
✔ Answer: 43
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5) 34 + 22
- Add the ones: 4 + 2 = 6
- Add the tens: 30 + 20 = 50
- Total: 50 + 6 =
56
✔ Answer: 56
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6) 33 - 20
- Subtract the ones: 3 - 0 = 3
- Subtract the tens: 30 - 20 = 10
- Total: 10 + 3 =
13
✔ Answer: 13
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7) 42 + 44
- Add the ones: 2 + 4 = 6
- Add the tens: 40 + 40 = 80
- Total: 80 + 6 =
86
✔ Answer: 86
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8) 62 - 11
- Subtract the ones: 2 - 1 = 1
- Subtract the tens: 60 - 10 = 50
- Total: 50 + 1 =
51
✔ Answer: 51
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9) 58 + 11
- Add the ones: 8 + 1 = 9
- Add the tens: 50 + 10 = 60
- Total: 60 + 9 =
69
✔ Answer: 69
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10) 94 - 73
- Subtract the ones: 4 - 3 = 1
- Subtract the tens: 90 - 70 = 20
- Total: 20 + 1 =
21
✔ Answer: 21
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11) 21 + 57
- Add the ones: 1 + 7 = 8
- Add the tens: 20 + 50 = 70
- Total: 70 + 8 =
78
✔ Answer: 78
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12) 37 - 14
- Subtract the ones: 7 - 4 = 3
- Subtract the tens: 30 - 10 = 20
- Total: 20 + 3 =
23
✔ Answer: 23
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13) 35 + 33
- Add the ones: 5 + 3 = 8
- Add the tens: 30 + 30 = 60
- Total: 60 + 8 =
68
✔ Answer: 68
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14) 58 - 16
- Subtract the ones: 8 - 6 = 2
- Subtract the tens: 50 - 10 = 40
- Total: 40 + 2 =
42
✔ Answer: 42
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15) 12 + 76
- Add the ones: 2 + 6 = 8
- Add the tens: 10 + 70 = 80
- Total: 80 + 8 =
88
✔ Answer: 88
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✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 1) | 39 |
| 2) | 56 |
| 3) | 94 |
| 4) | 43 |
| 5) | 56 |
| 6) | 13 |
| 7) | 86 |
| 8) | 51 |
| 9) | 69 |
| 10) | 21 |
| 11) | 78 |
| 12) | 23 |
| 13) | 68 |
| 14) | 42 |
| 15) | 88 |
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🔍 Explanation:
All problems involve
two-digit numbers and use
columnar addition/subtraction. The key steps are:
1. Align digits by place value (ones under ones, tens under tens).
2. Perform operations from right to left.
3. For addition: carry over if sum exceeds 9.
4. For subtraction: borrow if needed (though not required here).
This worksheet is excellent for practicing foundational arithmetic skills in Year 1 mathematics!
Let me know if you'd like a printable version or a visual explanation! 🌟
Parent Tip: Review the logic above to help your child master the concept of worksheet on addition and subtraction.
