Mathematics·Probability·conceptual
The 0-to-1 Probability Scale
Understand probability as a measure expressed as a number between 0 (impossible) and 1 (certain); place events on the probability scale; express probabilities as fractions, decimals, and percentages
Suggested ages 10–11
Evidence of understanding
- Place events on a number line from 0 (impossible) to 1 (certain), expressing positions as fractions or decimals
- Explain that a probability of 0.5 means 'even chance' and connect this to the informal word 'likely'
- Convert between informal language ('very unlikely') and a numerical position on the 0-to-1 scale
Assessment prompt
Can The 0-to-1 Probability Scale write the same probability as a fraction, a decimal, and a percentage — for example, knowing that an even chance is ½, 0.5, and 50%?
Standards alignment
No external standards are linked to this topic.