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Check out Symbolab for practice exercises and quizzes that help sharpen your mathematics and algebra skills.
An "operation" is a mathematical action such as addition, subtraction, multiplication, etc. When solving mathematical expressions, it is important to follow the order of operations--steps that should be followed to arrive at a correct answer.
Mathematical equations should be solved from left to right. Then solve in the following order using PEMDAS:
P Solve what appears in parentheses first
E Compute the exponents (roots) next
M Multiply from left to right
D Divide from left to right
A Add from left to right
S Subtract from left to right