Let’s solve each problem step by step.
We are told to:
1. Round each whole number to the nearest ten.
2. Multiply the two rounded numbers together.
3. Write the estimated product.
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Problem 2: 22 × 15
- Round 22 → nearest ten is
20
- Round 15 → nearest ten is
20 (since 15 is exactly halfway, we round up)
- Multiply: 20 × 20 =
400
✔ Estimated product:
400
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Problem 3: 72 × 45
- Round 72 → nearest ten is
70
- Round 45 → nearest ten is
50 (round up)
- Multiply: 70 × 50 =
3500
✔ Estimated product:
3500
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Problem 4: 63 × 39
- Round 63 → nearest ten is
60
- Round 39 → nearest ten is
40
- Multiply: 60 × 40 =
2400
✔ Estimated product:
2400
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Problem 5: 46 × 22
- Round 46 → nearest ten is
50
- Round 22 → nearest ten is
20
- Multiply: 50 × 20 =
1000
✔ Estimated product:
1000
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Problem 6: 89 × 45
- Round 89 → nearest ten is
90
- Round 45 → nearest ten is
50
- Multiply: 90 × 50 =
4500
✔ Estimated product:
4500
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Problem 7: 68 × 23
- Round 68 → nearest ten is
70
- Round 23 → nearest ten is
20
- Multiply: 70 × 20 =
1400
✔ Estimated product:
1400
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Problem 8: 92 × 32
- Round 92 → nearest ten is
90
- Round 32 → nearest ten is
30
- Multiply: 90 × 30 =
2700
✔ Estimated product:
2700
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Final Answer:
2. 400
3. 3500
4. 2400
5. 1000
6. 4500
7. 1400
8. 2700
Parent Tip: Review the logic above to help your child master the concept of estimation math worksheet.
