What is this I don't even

I told them to take a really basic selfie with their work

Using the gou gu

Me grading

A student shows how to add the natural numbers from one to x. The diagonal creates an isosceles right triangle, whose area is (1/2)x^2. Above the diagonal, there are x triangles, each with an area of 1/2. You can see the rest.

Balancing triangles on the centroid

Polar area (at Neeley School of Business at TCU)

Synthetic division problems with video solutions

Synthetic division

exercises for every calculus topic with video solutions

It's really the same amount of fun and interactivity that you get from flash cards.  Cough marketing cough.

matrix.reshish.com is the most convenient free matrix online calculator.