Help the local elementary school fix their playground by calculating the amount of sand needed near the swing set. The problem practices setting up proportions and ratios with three different options for solving. You can chose the option...

Algebra learners must know how to use rational numbers to approximate irrationals. This resource asks participants to decide which number is larger without using a calculator. It makes a great exercise to use as a five-minute transition...

[Free Registration/Login Required] This site includes a brief example of how sound detector boats work. It also includes an assessment for students to show their knowledge of using sound waves to predict the depth of water.