Find missing operations in expressions quiz online for students. In this quiz there are equations in which the operation sign is missing. Only one sign amongst a set of choices is correct. In the given examples, signs to substitute in equations are plus +, Minus – , division and multiplication x. Look at each equation carefully and substitute to see which sign makes the equations balanced. Only one sign is correct. There are more pre-algebra exercises like these on the worksheets section. Review mixed operations skills learned in 3rd, 4th, 5th and 6th grades.