With the exercise Math Blitz, you need to calculate the missing number to the equation. You need to remember the rules of calculation – eg. Multiplication and division come first, followed by addition and subtraction. Often, you will need to find the number which is missing to an equation which already shows a solution. As you progress the levels, this will get harder and harder. You will need to go as quickly as possible. The time you are given will become shorter as you get better at this exercise.