Probability
Probability with numbers worksheets
Find the chance of selecting a number from a finite set. Practice ranges up to 10, 25 or 50, count favorable outcomes and simplify the probability with an explained answer key.
Preview and downloadProbability practice
Spinner probability worksheets
Read number and letter spinners with 5 to 12 equal sectors. Count matching sectors from the printed diagram and calculate simplified probabilities with an answer key.
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Inspect the spinner shown with each question. Every sector has the same chance; count matching sectors, including separate sectors with the same label.
Download the practice pages alone, or include a separate answer key or teacher model. Longer activities may use more than one page.
Customize this worksheetTwo diagrams, fourteen questions
Each worksheet uses two independently generated spinners and seven questions for each. Choose sector counts from 5 through 12, and number labels, letter labels or both. Repeated labels occupy separate equal sectors.
The printed labels make the diagram readable in grayscale. Compare chances by counting the sectors for each label; a label occurring twice has twice the chance of a label occurring once.
Learning objective
What this activity builds
Connect a geometric model of equally likely sectors with exact count-based probabilities.
Worked example
A fair spinner has eight equal sectors labeled 1 through 8. What is the probability of landing on a number greater than 5?
3/8.
The sectors labeled 6, 7 and 8 match. The sector labeled 5 does not, because the event says greater than 5. Count three matching sectors out of eight equal sectors.
Teaching notes
Make the practice count
- Check the number of sectors before using a denominator.
- Count sectors, rather than the number of distinct labels.
- Compare the printed diagram with the favorable outcomes in the key.
- Explain that equal angles justify equal chances in the ideal fair-spinner model.
Make it yours
Customize the practice
Choose your options, update the preview, then download the exact same pages.
Each worksheet uses two original equal-sector spinners. Repeated labels are separate equally likely sectors.
Enlarged pages scroll. PDF size stays the same.
A useful next step
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