Most of the Mastery topics have short videos explaining exactly how to solve those types of problems. Here are some links to videos for our upcoming topics:
Evaluating Expressions 2 variables: Here's the video
Adding & Subtracting Negative Numbers: Video Here
Multiplying & Dividing Negative Numbers: Watch Here
Order of Operations: Select from 4 videos
Distributive Property: Here
Combining Like Terms w/ Distributive Property: Video Here
Properties of Numbers 1: Here, and Here, and Here
Good Luck, let me know if you're having trouble with a particular topic.
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