Myths about teaching can hold you back
- Year 9
The probability scale
I can assign a numerical value to an outcome to give the probability that the outcome will occur.
- Year 9
The probability scale
I can assign a numerical value to an outcome to give the probability that the outcome will occur.
Lesson details
Key learning points
- Probability is a measure of the likelihood of an outcome happening.
- An outcome can be assigned a numerical value from 0 to 1
- The probability scales shows the numerical values that an outcome might have.
Keywords
Probability - The probability that an event will occur is the proportion of times the event is expected to happen in a suitably large experiment.
Common misconception
Pupils think that 'likely' from the scale of likelihoods is only equal to a specific probability (e.g. 75%).
All probabilities that are greater than 50% but less than 100% are equivalent to 'likely' on the scale of likelihoods.
To help you plan your year 9 maths lesson on: The probability scale, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 9 maths lesson on: The probability scale, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 maths lessons from the Probability: theoretical probabilities unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which letter on the scale of likelihoods represents 'even chance'?
Q2.What does the letter A represent on the scale of likelihoods?
Q3.Which word describes the likelihood of an outcome that is guaranteed to happen?
Q4.Which percentage is equivalent to 0.1?
Q5.Which fraction is equivalent to 50%?
Q6.What is 25% of 2000?
Assessment exit quiz
6 Questions
Q1.The letter E on the scale represents a probability of %.
Q2.Which probabilities are equivalent to an 'even chance'?
Q3.What is the probability of an event that is impossible?
Q4.Which is the probability that this spinner lands on 'win'?
Q5.A trial has three possible outcomes: {A, B, C}. P(A) = $${1}\over{2}$$. P(B) = $${1}\over{3}$$. P(C) = $${1}\over{6}$$. Which outcome is most likely to happen?
Q6.The probability on an outcome is 20%. Approximately how many times could you expect the outcome to occur in 500 trials?