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.
Watch the video to learn how to play
Transcript
OK, everybody, welcome back! We're here today to have a look at the game multiplication toss, which some people also call how close to 100. To play today I'm using a spinner, and I just made it by printing out a decagon and drawing lines across the opposite angles and labeling it from 0 to 9.
And I'm going to use my paper clip that I found in the drawer, and a pen and I can flick it...
Transcript coming soon.
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.
Watch the video for another way to play
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?