Probability Scales
Putting chance on a scale from 0 to 1, and writing it as a fraction.
What this lesson covers
Probability Scales is a 9-part Class 5 Mathematics lesson. Each part makes one point and then hands over to the next, so it can be read in a sitting or picked up again at the part you stopped on. It defines the idea in plain words before using it, works through an example step by step, breaks the topic into its parts and compares them, shows where it is used outside the textbook, names the mistakes that cost marks in an exam, ends with a recap of what to remember.
How it begins
Every probability sits on a scale from 0 to 1. 0 means impossible; 1 means certain; ½ is an even chance.
The 9 parts
- From impossible to certain
- Writing probability as a fraction
- More than one way to win
- The probabilities must total 1
- Placing events on the scale
- Bags and spinners
- Where marks go
- What to remember
- Watch one worked through
Practise Probability Scales
Everything on QuizByt for Class 5 Mathematics that goes with this lesson: read it first, then test yourself while it is fresh.
🧠 5 quizzes on Probability Scales (2 easy, 2 medium, 1 hard)
Work up from easy to hard: the hard quiz asks the Class 5 exam-style questions on Probability Scales.
🖨️ Printable worksheet
Probability Scales on paper for Class 5, with room to write the working out. Preview the first page free.
🎮 Games for Class 5 Mathematics
Number and logic games at the right level for Class 5. Passing a quiz on Probability Scales earns the credits that open them.
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