PassNova has 5 free KS3 Maths practice questions on Probability, each with a clear explanation. Practise them in the browser with instant feedback — 100% free, no sign-up, on any device. Updated for 2026.
Probability: example questions & answers
5 worked examples with answers and explanations below. Practise them in the browser with instant feedback on every answer.
A fair six-sided dice is rolled. What is the probability of rolling a 4?
- A1/2
- B1/4
- C1/6✓
- D4/6
Answer: There is one '4' out of six equally likely outcomes, so the probability is 1/6.
What is the probability of an event that is certain to happen?
- A0
- B0.5
- C1✓
- D2
Answer: Probabilities range from 0 (impossible) to 1 (certain). A certain event has probability 1.
A bag has 3 red and 2 blue balls. What is the probability of picking a red ball?
- A2/5
- B3/5✓
- C1/2
- D3/2
Answer: There are 5 balls in total and 3 are red, so P(red) = 3/5.
A coin is flipped. What is the probability of getting tails?
- A1/4
- B1/2✓
- C1
- D2
Answer: A fair coin has two equally likely outcomes, so P(tails) = 1/2.
The probabilities of all outcomes of an event must add up to:
- A0
- B1✓
- C10
- D100
Answer: The probabilities of all possible outcomes of an event always sum to 1.