Idea 20of 22Builds onWhich spinner gives the better chance?
Is the game fair?
How can you tell if a spinner game is fair?
Today you'll discover
- what makes a game fair
- how to check each player's chance
- what an unfair game looks like
Think firstAna scores on orange, Ben on blue
Ana scores on orange, Ben on blue. Is this a fair game?
Decide first, then press Next. Count each player's equal sections.
A spinner of four equal sections, orange, blue, orange, blue, with the line Ana scores on orange, Ben scores on blue. Then Ana 2/4 and Ben 2/4, and the verdict fair. Then a spinner of three orange sections and one blue: Ana 3/4, Ben 1/4, not fair. The last step shows a spinner for three players: two orange, one blue, three green sections.
See the whole ideathe big idea and the key word, in one place
The big idea
A game is fair when every player has the same chance of winning.
Compare themFair: Ana 2/4, Ben 2/4. Not fair: Ana 3/4, Ben 1/4. Ana would usually win the second game.
Easy to get wrongOne colour each is not enough. The colours must cover the same share of the spinner.
Key word
- fair game
- a game where every player has the same chance of winning
Ready to use it?
- Decide whether a spinner game is fair.
- Say which player has the best chance.