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Estimating Differences (Grade 3)

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Estimating Differences

1. 
Estimate the difference. Round each number to the nearest hundred, then subtract.
[math]996 - 257[/math]
  1. 600
  2. 700
  3. 800
  4. 900
 
2. 
Estimate the difference. Round each number to the nearest ten, then subtract.
[math]247 - 106[/math]
  1. 100
  2. 130
  3. 140
  4. 200
3. 
Estimate the difference. Round each number to the nearest ten, then subtract.
[math]671 - 485[/math]
  1. 180
  2. 190
  3. 200
  4. 210
 
4. 
Estimate the difference. Round each number to the nearest hundred, then subtract.
[math]218 - 149[/math]
  1. 50
  2. 100
  3. 250
  4. 200
5. 
Estimate the difference. Round each number to the nearest ten, then subtract.
[math]54 - 38[/math]
  1. 10
  2. 20
  3. 30
  4. 40
 
6. 
Estimate the difference. Round each number to the nearest hundred, then subtract.
[math]936 - 390[/math]
  1. 500
  2. 550
  3. 600
  4. 650
7. 
Estimate the difference. Round each number to the nearest ten, then subtract.
[math]95 - 23[/math]
  1. 50
  2. 60
  3. 70
  4. 80
 
8. 
Estimate the difference. Round each number to the nearest hundred, then subtract.
[math]875 - 482[/math]
  1. 300
  2. 390
  3. 400
  4. 490
9. 
Estimate the difference. Round each number to the nearest ten, then subtract.
[math]763 - 89[/math]
  1. 600
  2. 670
  3. 690
  4. 700
 
10. 
Estimate the difference. Round each number to the nearest ten, then subtract.
[math]516 - 61[/math]
  1. 430
  2. 440
  3. 450
  4. 460
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