Estimating Sums to the Nearest 10 and 100

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Presentation transcript:

Estimating Sums to the Nearest 10 and 100 Copyright © 2010 Kelly Mott

Part 1:Estimating Sums to the Nearest Ten Copyright © 2010 Kelly Mott

Practice # 1: Round to the nearest ten. Estimate each sum. 65 _ _ 82 _ _ 24 _ _ 13 _ _ + + + + Steps: 1. Round each to the nearest 10. 2. Then add. Copyright © 2010 Kelly Mott

Practice # 2: Round to the nearest ten. Estimate each sum. 87 _ _ 25 _ _ 64 _ _ 36 _ _ + + + + Steps: 1. Round each to the nearest 10. 2. Then add. Copyright © 2010 Kelly Mott

Practice # 3: Round to the nearest ten. Estimate each sum. 58 _ _ 11 _ _ 71 _ _ 26 _ _ + + + + Steps: 1. Round each to the nearest 10. 2. Then add. Copyright © 2010 Kelly Mott

Practice # 4: Round to the nearest ten. Estimate each sum. 35 _ _ 8 _ _ 63 _ _ 51 _ _ + + + + Steps: 1. Round each to the nearest 10. 2. Then add. Copyright © 2010 Kelly Mott

Practice # 5: Round to the nearest ten. Estimate each sum. 77 _ _ 33 _ _ 62 _ _ 14 _ _ + + + + Steps: 1. Round each to the nearest 10. 2. Then add. Copyright © 2010 Kelly Mott

Part 2:Estimating Sums to the Nearest Hundred Copyright © 2010 Kelly Mott

Practice # 1: Round to the nearest 100. Estimate each sum. 532 _ _ _ 371 _ _ _ 183 _ _ _ 406 _ _ _ + + + + Steps: 1. Round each to the nearest 100. 2. Then add. Copyright © 2010 Kelly Mott

Practice # 2: Round to the nearest 100. Estimate each sum. 229 _ _ _ 330 _ _ _ 450 _ _ _ 199 _ _ _ + + + + Steps: 1. Round each to the nearest 100. 2. Then add. Copyright © 2010 Kelly Mott

Practice # 3: Round to the nearest 100. Estimate each sum. 645 _ _ _ 253 _ _ _ 561 _ _ _ 131 _ _ _ + + + + Steps: 1. Round each to the nearest 100. 2. Then add. Copyright © 2010 Kelly Mott

Practice # 4: Round to the nearest 100. Estimate each sum. 151 _ _ _ 220 _ _ _ 293 _ _ _ 309 _ _ _ + + + + Steps: 1. Round each to the nearest 100. 2. Then add. Copyright © 2010 Kelly Mott

Practice # 5: Round to the nearest 100. Estimate each sum. 757 _ _ _ 424 _ _ _ 436 _ _ _ 127 _ _ _ + + + + Steps: 1. Round each to the nearest 100. 2. Then add. Copyright © 2010 Kelly Mott

Copyright © 2010 Kelly Mott