Order of operations refers to which operations are solved first, second and so forth in a mathematical expression containing more than one process. Mathematical operations include such processes as addition, subtraction, multiplication, division and squaring.
Calculations should be completed from left to right in the problem. The correct order of operations to use in a mathematical problem involves doing the calculations in parentheses first and those with exponents second, followed by those requiring multiplication and division in the order in which they occur in the problem and, finally, those with addition and subtraction in the order in which they occur. The acronym PEMDAS serves as a reminder of the order of operations.