Yale University
Yale New Haven Teachers Institute: Solving Problems "By the Hundreds"
The Yale-New Haven Teachers Institute site contains various math exercises relating to percentage and consumer-related problems. An explanation of sales tax, a related problem and answer are given.
CK-12 Foundation
Ck 12: Elem Math: Dividing to Find the Unit Working Product
[Free Registration/Login may be required to access all resource tools.] In this learning module, students solve word problems where they must find the unit working product, which is the whole product divided by an amount used or...
University of Nebraska Omaha
Ec Ed Web: How Can Big Business Make Money From Tariffs?
In this activity, students investigate the impact of tariffs on businesses and consumers during the 1880s by looking at a political cartoon, solving a short math problem, and comparing protectionism between time periods. They then...
Khan Academy
Khan Academy: Writing Proportions
Practice writing proportions to describe real-world situations. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.