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Key Stage 3 Probability
Probability Scale
Place probabilities on the 0 to 1 scale using fractions, decimals and percentages.
Key idea
Define the possible outcomes clearly, then compare favourable outcomes with the total outcomes.
What you will learn
Use 0 to 1 scale confidently.
Use fractions confidently.
Use decimals confidently.
Use percentages confidently.
Success checklist
✓I can explain what probability scale 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.