Want to help your seventh-grader master math? Here are some of the skills your child will be learning in the classroom in seventh grade. At a “25% Off” sale, Marissa buys a skirt for $40.50. What was ...

Twenty secondary mathematics teachers described their thinking as they solved four proportion problems (Task 1), explained how they would teach two of the problems (Task 2), and solved four similar ...

Test your knowledge of taxicab geometry, triangular numbers, the golden ratio and more. Credit... Supported by By Steven Strogatz “Math, Revealed,” our four-part series exploring the mathematics ...