Probability is all about how likely it is for a specific event to occur. We see it used all around us, in weather forecasts, the lottery, betting on the horses and so on. This GCSE Maths quiz focuses on the mathematical way of working with probability, which is on a scale from zero (impossible) to 1 (absolutely will happen). The probability of an event occurring is written as a decimal or a fraction, so make sure you can work with both!
To calculate the probability of an event, we need to know the number of successful outcomes (e.g. the number of red counters in a bag) and divide it by the total number of outcomes (e.g. the total number of counters in a bag). The result will always be between 0 and 1 – if not, check your working!