Equation has two tools:
Chrome Extension that is THE BEST equation editor I have ever seen!
MathSpaces: A math-oriented interactive digital whiteboard. You can event draw out a math problem, send it to your students (with a link), and have them submit their answers!
Premium access is FREE for teachers!
Still now sure that you need this?
Install & Setup: How to install the Chrome extension and sign up for your free premium teacher account.
Use Equatio with Google Forms: Insert math formulas into your Google Form as you create quizzes. (Unfortunately students don't receive premium access, so they can't type math as answers)
Mathspace: Click here to access mathspace
Hand Drawing Tool: Mathspace has the same equation editor features as the Chrome App, but you can also draw by hand on your canvas.
Shapes & Manipulatives: This is a Geometry teachers' best friend! Easily add any shape to your canvas.
Graphing: Easily add beautiful graphs.