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Estimation for addition - Video Lesson
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Video on "Rounding to Estimate Sums"
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Khan Academy
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More videos on Number Sense
Basic Number Comparison
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Place Value Through Hundreds
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Counting by 2's, 5's, 10's
Counting By Two and Five and Ten
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Commutative Law of Addition
Associative Law of Addition
Rounding to Estimate Sums 2
Rounding to Estimate Sums
Rounding to Estimate Differences
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