"PEMDAS"
P- Parentheses
E- Exponents
M- Multiplication
D- Division
A- Addition
S- Subtraction
Note: multiplication and division are interchangeable. addition and subtraction are also interchangeable. parentheses THEN must stay the same, though.
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order of operations
You memorize the rules that are considered standard.
If you change the order of operations, you will get a different result. The person who wrote the expression had a specific order of operations in mind (using generally-accepted rules), so arbitrarily using some other order of operations is, quite simply, wrong.
what is a special set of rules that gives the order in which calculations are done to solve a problem