Thomas Jefferson National Accelerator Facility
Jefferson Lab: Speed Math Deluxe
Play this interactive math game and practice your order of operation rules at the same time. If you can't remember just click on the link "order of operations," for a quick refresher!
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Dans Math: Lessons: Order of Operations
This is a brief explanation of the order of operations that includes some simple examples. It also has directions for dealing with parentheses and exponents.