1-1 Expressions and Formulas. Order of Operations. What is the Order of Operations? It is a set of rules to find the exact value of a numerical expression. Why do we use the Order of Operations?
It is a set of rules to find the exact value of a numerical expression.
A long time ago, people just decided on an order in which operations should be performed. It has nothing to do with magic or logic. It makes communication easier, and everyone comes up with the same answer. (MathForum.org/Dr.Math)
“Please Excuse My Dear Aunt Sally” to help remember the order in which to evaluate the expression.
Evaluate inside the parentheses first: 4 + 2 = 6.
Then raise 6 to the second power: 36.
Now perform addition and subtraction from left to right: 36 - 8 = 28, now 28 +3 = 31.
Brackets are done.
Inside the brackets, perform multiplication and division before addition and subtraction
A = lw