Fun Math Kids

Young Geniuses · Ages 13 to 14

All Young Geniuses games

Conditional Probability Spinner

Read probability trees and calculate conditional probabilities in a forensic investigation bureau, for ages 13 to 14.

SpinnerTree diagrams for conditional probability~8 min per level3 levelsAll devices
  • Free · no account required
  • No sign-up
  • +10 XP per level
  • 3 levels
  • Plays on all devices
  • Grade-by-grade

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The learning journey

Every activity is one step. Here is where this one fits.

  1. Play(you are here)Learn the idea in a game
  2. PractiseLock it in on paper
  3. ReviewCome back and keep it sharp
  4. MasterTake on a harder challenge
  5. AchieveEarn a certificate

About Conditional Probability Spinner

Conditional Probability Spinner sends students into a forensic investigation bureau, where each case is solved by reasoning about a probability tree. Spinning to gather evidence and then multiplying along the branches to find P(A and B) from P(A) and P(B given A) builds the conditional-probability reasoning at the heart of GCSE Higher statistics, all wrapped in an analytical case-reconstruction story.

Chosen by the skills this activity practises.

A hand for grown-ups

Before you start
Find a calm few minutes with no rush. Let your child know it is fine to find some of it tricky — that is what practice is for.
While they work
Sit nearby but let them lead. If they get stuck, ask "what could you try?" rather than giving the answer — the thinking is the point.
Afterwards
Ask them to show you one they found easy and one they found hard. Praise the effort on the hard one, not just the right answers.
Watch out for
Rushing. If answers come too fast and wrong, slow the pace down together rather than pushing for more.
Away from the screen
Look for the same maths in everyday life — counting stairs, sharing snacks, spotting shapes on a walk.

How to play

  1. A question appears on screen

    A maths question is shown in large text at the centre of the play area. A timer bar begins counting down from 120 seconds.

  2. Choose the correct answer

    Answer options are shown as large buttons. Tap or click the correct option. Any input method works — touch, mouse or keyboard.

  3. Build your streak

    Each consecutive correct answer increases your streak. A longer streak lights up the flame icon and adds a bonus multiplier to the XP you earn for the level.

  4. Finish the level

    Each level has 4 questions. Complete them to earn the full level reward (+10 XP, plus up to +10 XP for a perfect run). Progress is saved locally and shown on the Parent Dashboard.

🎓 Curriculum

Curriculum alignment

Mapped to national curriculum frameworks so teachers and parents can match practice to school standards.

  • United StatesCommon Core State Standards for Mathematics · probability, statistics, reasoningAligned to probability, statistics, reasoning number and operations objectives.
  • EnglandNational Curriculum in England: mathematics · probability, statistics, reasoningAligned to probability, statistics, reasoning number and operations objectives.
  • AustraliaAustralian Curriculum: Mathematics (Version 9.0) · probability, statistics, reasoningAligned to probability, statistics, reasoning number and operations objectives.
  • Canada (Ontario)The Ontario Curriculum, Grades 1–8: Mathematics (2020) · probability, statistics, reasoningAligned to probability, statistics, reasoning number and operations objectives.
❓ FAQ

Common questions from parents & teachers

Everything you need to know before your child starts playing.

  • It is designed for ages 13 to 14 (grade 8 and grade 9).

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