Two-step compound events

List every outcome of a two-step experiment using arrays, tables and tree diagrams, and calculate probabilities of compound events.

⏱ 20 min❓ 10 questions

What you'll be able to do

✔I can list the sample space of a two-step experiment in an array or table
✔I can use a tree diagram when outcomes are not equally likely
✔I can calculate the probability of compound events such as sums, products and ‘exactly one’

How this works

1Read the short explanations first — they teach you what you need before each question.
2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.

What's inside

10 questions and 1 quick teaching card, including:

🔢Number answer — Work out the answer and type the number.
✏️Fill in the blank — Type the missing word to complete the sentence.

👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.

Curriculum: AC9M9P01