An interactive quiz from WyzAnt of 20 proportions are presented for the students to solve and then check their answers. All can be computed with simple cross-multiplying.

This lesson will introduce the meaning of weighted average, and demonstrate how to solve for the weighted average of a data set. Students can look at a presentation and then take an online quiz.

This lesson will introduce the meaning of weighted average, and demonstrate how to solve for the weighted average of a data set. Students can look at a presentation and then take an online quiz.

In this video, Brian Gervase explains how the size a of television screen affects how much of a movie people are able to watch. [3:33] Followed by a short quiz and a list of additional resources to explore.