How to Cite "Estimating Sums, Differences, Products, and Quotients" from CliffsNotes.com:

CliffsNotes.com. Estimating Sums, Differences, Products, and Quotients. 30 Jul 2014
<http://www.cliffsnotes.com/math/basic-math/basic-math-and-pre-algebra/whole-numbers/estimating-sums-differences-products-and-quotients>.



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