Algebra Properties Sheet- I'm sure that at the rate K is running with math in the 3rd grade, they should be to this by the end of the year. :S (No, I'm not serious, but geese though.)

This explains the Order of Operations. It addresses the Common Core 5th Grade Math Operations and Algebraic Thinking stardard 5.OA.1: Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols.