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http://www.educreations.com/lesson/view/lesson-36-reading-and-writing-whole-numbers-and-ex/2322194/?ref=link
Rounding Whole Numbers
https://www.khanacademy.org/math/arithmetic/multiplication-division/rounding_whole_numbers/v/rounding-whole-numbers-1
.
http://www.educreations.com/lesson/view/lesson-36-reading-and-writing-whole-numbers-and-ex/2322194/?ref=link
Rounding Whole Numbers
https://www.khanacademy.org/math/arithmetic/multiplication-division/rounding_whole_numbers/v/rounding-whole-numbers-1
.