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Fabric bag open at the top, showing a number of blue marbles.

problem

Marbles and Bags

14 to 16

Two bags contain different numbers of red and blue marbles. A marble is removed from one of the bags. The marble is blue. What is the probability that it was removed from bag A?

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Solving Together - Estimating Angles

Week 2
How well can you estimate angles? Playing this game could improve your skills.

game

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More Dicey Operations

7 to 14

In these multiplication and division games, you'll need to think strategically to get closest to the target.

game

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Vector Gem Collector

14 to 18

Use vectors to collect as many gems as you can and bring them safely home!

problem

Square Surprise

5 to 11

Why do you think that the red player chose that particular dot in this game of Seeing Squares?

problem

Tic Tac Toe

11 to 14

In the game of Noughts and Crosses there are 8 distinct winning lines. How many distinct winning lines are there in a game played on a 3 by 3 by 3 board, with 27 cells?