Instructional Videos
Khan Academy is an online video website with instructional videos on virtually every math topic known to humankind.
Online Algebra Tiles
Free Graphing Calculator Software
Desmos - Web Based Graphing Calculator (any platform)
You can also download the app for free.
Free Scientific Calculator For Your Phone
The calculator that comes standard with your phone is usually junk. Here are some good ones you can download from the Apple Store and Google Play. If you have some other good ones, let me know and I will add it to the list.
Web Based Scientific Calculator
App Store (Apple)
Calculator#
Google Play
HiPER Scientific Calculator