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en.wikipedia.org/wiki/Order_of_operations

In mathematics and computer programming, the

www.mathgoodies.com/lessons/vol7/order_operations.html

To follow the order of operations in math, first do any calculations that are inside parentheses and take care of exponents and roots. Next, perform all multiplications and divisions, left to right. Then do all additions and subtractions, left to right.

A handy mnemonic for remembering the order of operations is PEMDAS, or "Please excuse my dear aunt Sally".

www.purplemath.com/modules/orderops.htm

Explains the

www.khanacademy.org/math/algebra-basics/core-algebra-foundations/algebra-foundations-order-of-operations/v/order-of-operations

Work through a challenging

www.eduplace.com/math/mathsteps/4/a/index.html

But what happens when an expression requires multiple operations? Over time,
mathematicians have developed a set of rules called the

mathforum.org/library/drmath/view/52582.html

Can you give me some facts and conjectures about when, where, and why the

www.reference.com/history/invented-order-operations-5906255dc205d235

In mathematics, the

www.math.ucdenver.edu/~jloats/Student pdfs/4_Order of OperationsSass.pdf

about the history of

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Please-Parenthesis. Excuse-Exponents. My-Multipication. Dear-Division. Aunt-Addition. Sally-Subtraction.
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