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PEMDAS is the typical way that the order of operations is taught in school (though I guess GEMDAS is gaining some traction: groupings instead of parentheses). The order of operations is important as it's part of the grammar of a number sentence and ensures that everyone will agree on the value of an expression. However, hidden inside the acronym PEMDAS are some "lies" about arithmetic that tend to mess us up. This video is designed to dispel those "lies" and help you understand the reason that PEMDAS exists in the first place. In particular, this video explains why the rule for MD and AS is always left to right and why the rule should really be PEMA. Partway through the video, I reference the associative property of addition and multiplication and remark that there is a link in the description. Here is a link to a khanacademy lesson on the associative property if you want to learn more about it. Khan Academy video on the associative property: • Associative law of addition | Arithmetic p... After you finish watching the video, there are bonus points for anyone who can come up with a great acronym for PEMA and add it in the comments.