Double or halve?

Adapted from NRICH

Collect resources

You will need:

• 2 different coloured markers or coloured pencils​

• something to write on​

• a 6-sided dice or a 1-6 spinner

• a 9-sided dice or a 0-9 spinner.

How to play

• Choose a target number between 0 - 100 and write this on your sheet of paper.

• The first player rolls the dice and chooses whether to double or halve the number.

  • Record the roll.

• Take it in turns to roll the dice, keeping a running total.

  • If a player can't go, they miss a turn.

• The winner is the player who reaches the target number exactly.

Discuss/reflect

• Does it matter if you go first or second? Does it increase your chances of winning? Why or why not?

• If you could play the same game again are there any moves you would change? Why or why not?

• What are you thinking about in order to try to win the game?