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Key Stage 3 Probability
Probability Language
Use likely, unlikely, certain, impossible, even chance and other probability vocabulary.
Key idea
Define the possible outcomes clearly, then compare favourable outcomes with the total outcomes.
What you will learn
Use certain confidently.
Use impossible confidently.
Use likely confidently.
Use even chance confidently.
Success checklist
✓I can explain what probability language means.
✓I can choose a suitable method without being told.
✓I can show clear working and check my answer.
Worked example
A fair dice is rolled. Find P(rolling a 6).
Step 1
There are 6 equally likely outcomes.
Step 2
Only one outcome is a 6.
Step 3
P(6) = 16.
Answer
16
Quick practice
Question 1
Find P(heads) for a fair coin.
Question 2
A bag has 3 red and 5 blue counters. Find P(red).
Question 3
List the outcomes for tossing two coins.
Related resources
These are linked to the wider Probability topic for now.