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CK-12 Foundation
Ck 12: Arithmetic: Prices Involving Discounts Grade 8
[Free Registration/Login may be required to access all resource tools.] Find discount prices given sales involving percents.
Yale University
Solving Problems by the Hundreds
This site contains a study of percentage and its applications in the study of consumer related problems. Problems involving sales tax are included. Examples, explanation, solutions and a bibliography are also included in the site.
PBS
Pbs: The Lowdown: Percents Combined: Proportional Relationships With Multistep Ratio and Percent Problems
Learn how to calculate sale price when combining two "percent-off" discounts in this video from KQED. In the accompanying classroom activity, students develop and share a variety of strategies, including modeling with a 10 x 10 grid to...
AAA Math
Aaa Math: Consumer Math
From basics such as adding and subtracting money, converting coins, and making change to more advanced topics such as sales tax and simple interest, this interactive tutorial offers help with consumer math issues.