Multiplication by zero quiz for students. The rule for multiplying by zero is simple. When you do this, the outcome is always zero. So no matter how large a number is, when you multiply it by zero the outcome will always be zero. For example, 425 x 0 = 0. This rule is always the same in every situation. Students only have to maintain this rule and they will be able to solve any similar problem. There are pdf printable tests under the worksheets section on this skill. Review basic multiplication concepts in 2nd, 3rd, 4th and 5th grades.