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Math Mastery: Decimals and Percents. Math Mastery. 2001. Cosmeo. 18 April 2015
Math Mastery: Decimals and Percents. Math Mastery (2001). Retrieved April 18, 2015, from Cosmeo: http://www.cosmeo.com/
Math Mastery. "Math Mastery: Decimals and Percents."