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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".

en.wikipedia.org/wiki/Order_of_operations

In mathematics and computer programming, the order of operations (or operator precedence) is a collection of rules that reflect conventions about which ...

www.purplemath.com/modules/orderops.htm

Explains the order of operations ('PEMDAS' or 'BODMAS') in plain terms, points out common mistakes, and presents worked examples of simplifying by applying  ...

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

Order of Operations presented by Math Gooodies. Learn order of operations with our self-paced instruction.

www.mathsisfun.com/operation-order-pemdas.html

"Operations" means things like add, subtract, multiply, divide, squaring, etc. ... Warning: Calculate them in the wrong order, and you will get a wrong answer !

www.khanacademy.org/math/pre-algebra/pre-algebra-arith-prop/pre-algebra-order-of-operations/v/introduction-to-order-of-operations

This example shows the steps and clarifies the purpose of order of operations: to have ONE way to interpret a mathematical statement.

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

The Order of Operations. When children initially learn addition, subtraction, multiplication, and division, they begin by performing operations on two numbers.

www.wyzant.com/resources/lessons/math/algebra/order_of_operations

The Order of Operations is very important when simplifying expressions and equations. The Order of Operations is a standard that defines the order in which you ...

www.mathplayground.com/order_of_operations.html

Play Order of Operations at MathPlayground.com! Use the order of operations to correctly solve the problems.

www.math.com/school/subject2/lessons/S2U1L2GL.html

When expressions have more than one operation, we have to follow rules for the order of operations: First do all operations that lie inside parentheses. Next, do ...