Being collaborative

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.

Sequences of multiples keep cropping up...

Here is a chance to play a fractions version of the classic Countdown Game.

Construct two equilateral triangles on a straight line. There are two lengths that look the same - can you prove it?

The clues for this Sudoku are the product of the numbers in adjacent squares.

In this game the winner is the first to complete a row of three. Are some squares easier to land on than others?

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a rhombus.

Ben, Jack and Emma passed counters to each other and ended with the same number of counters. How many did they start with?

Which of these games would you play to give yourself the best possible chance of winning a prize?