Extra info & links:
Math in Chemistry Multiple Choice practice
Basic sig fig rules-https://www.youtube.com/watch?v=TZIPNzc5yT0
Multiplication and division with sig figs-https://www.youtube.com/watch?v=o5BmoMDJLRY
Addition and subtraction with sig figs-https://www.youtube.com/watch?v=2eXC6s9X6Wc