Simplify numerical expression calculator that shows work to solve the numerical expressions having array of operations like addition, subtraction, multiplication and division altogether or any of the combination in an expression. The step-by-step calculation help parents to assist their kids studying 4th, 5th or 6th grade to verify the work and answers of simplify the following numerical expression homework and assignment problems in pre-algebra or in operations and algeraic thinking (OA) of common core state standards (CCSS) for mathematics.