Math Magician for iOS
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  Worksheet: Math - Rounding 2

  Round to hundreds and to thousands. Common Core: 4.NBT.A.3
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  Worksheet: Estimation Station Sums to 10 (upper elem)

  Worksheet practicing rounding numbers to the nearest 10 and estimating the sums. Common Core: 4.NBT.A.3
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  Morning Math: Rounding 4

  9,683 + 5,044. Rounding to 10,000. Common Core: 4.NBT.A.3
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  Worksheet: Estimation Station Differences (upper elem)

  Worksheet practicing rounding numbers to the nearest 10 and estimating the differences. Common Core: 4.NBT.A.3
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  Rules and Practice: Rounding to Whole Numbers (elem)

  This mini-unit features plenty of practice for rounding to whole numbers. Common Core: 4.NBT.A.3
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  Worksheet: Estimation Station Sums to 100 (upper elem)

  Worksheet practicing rounding numbers to the nearest 100 and estimating the sums. Common Core: 4.NBT.A.3
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  Morning Math: Rounding 3

  1,527 + 1,031. Rounding to 1000 Common Core: 4.NBT.A.3
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  Morning Math: Rounding 2

  255 + 613. Rounding to 100 Common Core: 4.NBT.A.3