For years Jenny Eather’s A Maths Dictionary for Kids has been a favorite resource of mine and many other teachers for years. Maths Charts by Jenny Eather is the iPad companion to the website.
Math Charts by Jenny Eather provides simple and clear definitions of math terms. Each definition includes a diagram to illustrate the term’s definition. You can print any and all of the visuals included in the app.
The first few charts in each section of the app are free. You do have to buy the full version of the app in order to unlock all of charts in Math Charts by Jenny Eather.