Let's solve each problem step by step and explain the solution.
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1. Addition: 42 + 35 = ?
Break it down:
- Add the tens: 40 + 30 = 70
- Add the ones: 2 + 5 = 7
- Total: 70 + 7 =
77
✔ Correct answer:
77
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2. Subtraction: 76 - 24 = ?
Break it down:
- Subtract the tens: 70 - 20 = 50
- Subtract the ones: 6 - 4 = 2
- Total: 50 + 2 =
52
✔ Correct answer:
52
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3. Addition: 13 + 58 = ?
Break it down:
- Add the tens: 10 + 50 = 60
- Add the ones: 3 + 8 = 11
- Total: 60 + 11 =
71
✔ Correct answer:
71
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4. Subtraction: 83 - 57 = ?
Break it down:
- Subtract the tens: 80 - 50 = 30
- Subtract the ones: 3 - 7 → can't do, so borrow 1 from the tens.
- 83 becomes 70 + 13
- Now subtract: 70 - 50 = 20; 13 - 7 = 6
- Total: 20 + 6 =
26
✔ Correct answer:
26
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5. Word Problem: 17 + 34 + 22 + 9 = ?
Add step by step:
- First: 17 + 34 = 51
- Then: 51 + 22 = 73
- Finally: 73 + 9 =
82
✔ Correct answer:
82
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✔ Final Answers:
1.
77
2.
52
3.
71
4.
26
5.
82
You should mark the boxes next to these answers on the worksheet.
Let me know if you'd like a printable version or help with similar problems! 🌸
Parent Tip: Review the logic above to help your child master the concept of addition and subtraction worksheet 100 problems.
