These are some math concept lessons. They aren’t so much a detailed explanation of how to do the computations, they use Google Sheets for most of the computations. The purpose is mainly to give viewers an intuitive feel for what the concepts mean.
For more detailed explanations of the computations and manipulations I very strongly recommend Khan academy and will be including links to Khan in these pages for more lessons and examples.
Khan Academy
Slope – How fast is the change?
What is Slope
Order of Operations, Grouping, PEDMAS – Order Counts!
PEDMAS Intro