Can you find the values at the vertices when you know the values on the edges?
Semi-regular tessellations combine two or more different regular polygons to fill the plane. Can you find all the semi-regular tessellations?
Draw some quadrilaterals on a 9-point circle and work out the angles. Is there a theorem?
Can you decide whether these short statistical statements are always, sometimes or never true?
Sequences of multiples keep cropping up...
Construct two equilateral triangles on a straight line. There are two lengths that look the same - can you prove it?
How did the the rotation robot make these patterns?
How many winning lines can you make in a three-dimensional version of noughts and crosses?
Caroline and James pick sets of five numbers. Charlie tries to find three that add together to make a multiple of three. Can they stop him?
If you can copy a network without lifting your pen off the paper and without drawing any line twice, then it is traversable. Decide which of these diagrams are traversable.
