Find missing signs in an equation quiz online. Here children get to learn how to balance equations by finding the signs that make the equation correct for example, 5 ? 2 = 7. The question sign is definitely an addition sign. In some cases it will be a subtraction sign to make an equation balanced. Take the test and improve skills towards pre-algebra studied in this grade. This activity is for 2nd, 3rd, 4th, 5th grades.