I will solve this worksheet by following the instructions: multiply the numbers, round each whole number to the nearest ten, and then multiply the two rounded numbers together.
Let me go through each problem one by one.
Problem 1: This is already solved as an example.
- Original: 25 x 13 = 325
- Rounded: 30 x 10 = 300
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Problem 2: 22 x 15
- Round 22 to the nearest ten: 20
- Round 15 to the nearest ten: 20
- Multiply the rounded numbers: 20 x 20 = 400
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Problem 3: 72 x 45
- Round 72 to the nearest ten: 70
- Round 45 to the nearest ten: 50
- Multiply the rounded numbers: 70 x 50 = 3500
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Problem 4: 63 x 39
- Round 63 to the nearest ten: 60
- Round 39 to the nearest ten: 40
- Multiply the rounded numbers: 60 x 40 = 2400
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Problem 5: 46 x 22
- Round 46 to the nearest ten: 50
- Round 22 to the nearest ten: 20
- Multiply the rounded numbers: 50 x 20 = 1000
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Problem 6: 89 x 45
- Round 89 to the nearest ten: 90
- Round 45 to the nearest ten: 50
- Multiply the rounded numbers: 90 x 50 = 4500
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Problem 7: 68 x 23
- Round 68 to the nearest ten: 70
- Round 23 to the nearest ten: 20
- Multiply the rounded numbers: 70 x 20 = 1400
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Problem 8: 92 x 32
- Round 92 to the nearest ten: 90
- Round 32 to the nearest ten: 30
- Multiply the rounded numbers: 90 x 30 = 2700
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Here are the completed answers for the worksheet:
2. 22 →
20
x 15 → x
20
400
3. 72 →
70
x 45 → x
50
3500
4. 63 →
60
x 39 → x
40
2400
5. 46 →
50
x 22 → x
20
1000
6. 89 →
90
x 45 → x
50
4500
7. 68 →
70
x 23 → x
20
1400
8. 92 →
90
x 32 → x
30
2700
Parent Tip: Review the logic above to help your child master the concept of estimating numbers worksheet.
