Reaction timer
Keep it simple
Can all unit fractions be written as the sum of two unit fractions?
How would you score it?
Sociable cards
American billions
Olympic records
Place your orders
Constructing triangles
Generate three random numbers to determine the side lengths of a triangle. What triangles can you draw?
Fence it
Olympic measures
Isosceles triangles
Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?
All in a jumble
Power mad!
Powers of numbers behave in surprising ways. Take a look at some of these and try to explain why they are true.
Transformation game
Why not challenge a friend to play this transformation game?
Who's the best?
Coordinate patterns
Peaches today, peaches tomorrow...
Rhombus it
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.
Shapely pairs
A game in which players take it in turns to turn up two cards. If they can draw a triangle which satisfies both properties they win the pair of cards. And a few challenging questions to follow...
Property chart
A game in which players take it in turns to try to draw quadrilaterals (or triangles) with particular properties. Is it possible to fill the game grid?
Route to infinity
Method in multiplying madness?