We'd all love to have barrels of candy. An interactive shows the steps in evaluating a numerical expression that reflects the cost of buying several different barrels of candy.

Placement of parentheses is paramount. Scholars adjust the location of parentheses in a numerical expression so its value matches a given value. A slider interactive helps with this task.

For this electromagnetism and electromagnetic induction worksheet, learners answer 11 questions using calculus to determine things such as magnetic flux and wave output.