Order of operations 2

The  exercise appears under the 6th grade (U.S.) Math Mission. This exercise practices the order of operations, also called PEMDAS, in arithmetic, but with more complicated problems that Order of operations including exponents.

Types of Problems
There is one type of problem in this exercise:
 * 1) Evaluate the expression: This problem provides a numerical expression using any of a number of arithmetic operations. The student is expected to correctly follow the order of operations and find the correct simplification of the expression.

Strategies
Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction
 * 1) The most common words for order of operations is Parentheses, Exponents, Multiplication and Division, then Addition and Subtraction.
 * 2) The order of operations is also called PEMDAS or GEMDAS (if "grouping symbols" are substituted for "parentheses").
 * 1) The acronym "Please excuse my dear Aunt Sally" is also commonly used.
 * 2) When there are equally strong operations they are all to be performed in order from left to right.
 * 3) The order of operations arises because multiplication is effectively repeated addition, and exponentiation is effectively repeated multiplication.