In eighth grade, students focus on connecting their understanding of math to solve a variety of problems. Feb. 1, 2020, 10:48 AM PST Parent Toolkit Staff Getty Images ...

In January alone, it was used to solve 8 million math problems. And now, it is available on Android. It is still free and should resonate well with high school kids who have a cheap Android phone.

Mini-Course: Teaching Math In this free five-week email course, you’ll learn research-backed strategies to help students of all grade levels make sense of math.