Enhance essential elementary algebra skills with these twenty-one practice problems. Each problem has an expression with mixed operators to reinforce the concept of operator precedence and use of parentheses. Choose a problem to solve from the problem list, work the problem, and then confirm your answer by easily navigating the link to the complete instructive solution. Return to the practice problems to select another. Problems start with low difficulty and gradually increase to challenging. The first workbook in this subject series. Most appropriate for 4th and 5th grade students.