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Math Mastery: Decimals and Percents. Math Mastery. 2001. Cosmeo. 28 January 2015

Math Mastery: Decimals and Percents. Math Mastery (2001). Retrieved January 28, 2015, from Cosmeo: http://www.cosmeo.com/

Math Mastery. "Math Mastery: Decimals and Percents." Cosmeo. http://www.cosmeo.com/