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The last day for sending in solutions to the live problems is Monday 15 May.
problem
Favourite
Poly Plug Rectangles
Age
5 to 11
Challenge level
The computer has made a rectangle and will tell you the number of spots it uses in total. Can you find out where the rectangle is?
problem
Favourite
Seeing Squares
Age
5 to 11
Challenge level
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.
problem
Favourite
Complete the Square
Age
5 to 7
Challenge level
Complete the squares - but be warned some are trickier than they look!
problem
Favourite
Square Corners
Age
7 to 11
Challenge level
What is the greatest number of counters you can place on the grid below without four of them lying at the corners of a square?
problem
Favourite
Seeing Parallelograms
Age
7 to 11
Challenge level
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 parallelogram.
problem
Favourite
Stringy Quads
Age
7 to 11
Challenge level
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
problem
Favourite
Eight hidden squares
Age
7 to 14
Challenge level
On the graph there are 28 marked points. These points all mark the vertices (corners) of eight hidden squares. Can you find the eight hidden squares?
problem
Seeing Rhombuses
Age
7 to 11
Challenge level
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.