Why play this game?
This game is thought provoking and very engaging. It encourages discussion of place value, mental calculations and estimation, alongside valuable strategic mathematical thinking.
It can be played with 1-6 die but ideally would be played with a decahedral 0-9 dice or a spinner (an interactive 10-sided spinner is available here
Invite volunteers (perhaps working in teams of two) to play the game on the board and explain the rules to them and the rest of the class.
When the game is over confirm who has won and explain the scoring system.
Working in teams of two, set learners off on playing the game. Depending on your aims for the lesson, offer the simple or more complicated scoring system.
When appropriate, encourage learners to vary the targets.
Encourage learners to justify their strategies to their partners, and draw their ideas together at the end of the lesson.
How are you trying to get close to 100?
How are you deciding where to place the numbers?
How do you decide which targets are appropriate?
When working on the second version of the game whereby the four numbers are thrown before deciding where to place them, encourage learners to justify and prove that their arrangement is as close to 100 as possible.
You may wish to move learners on to Dicey Operations in Line
Simplify the calculations by using fewer cells in each game.
Perhaps provide learners with number cards that they can move around the grid to consider different options.
Pupils who find estimation difficult could use calculators to check their estimates.
Choose the easiest scoring system or allow calculators for scoring the more difficult version.
Allow pairs to play against other pairs, so that partners can support each other.