Matrices on the TI-Nspire: How to Add, Subtract and Multiply

This video covers some of the basics of using matrices on the TI-Nspire and TI-Nspire CAS. Here's a table of contents in case you want to jump around:

How to enter a matrix 0:00
Multiply by a constant/scalar 1:04
Add/subtract matrices 1:15
Input a matrix of any dimensions 2:03
Matrix multiplication 2:36