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Can you make a square from these triangles?

Investigate the effects of the half-lifes of the isotopes of cobalt on the mass of a mystery lump of the element.

Experiment with the interactivity of "rolling" regular polygons, and explore how the different positions of the dot affects its vertical and horizontal movement at each stage.

Explore when it is possible to construct a circle which just touches all four sides of a quadrilateral.

A napkin is folded so that a corner coincides with the midpoint of an opposite edge. Investigate the three triangles formed.

Charlie has moved between countries and the average income of both has increased. How can this be so?

Can you find an efficient method to work out how many handshakes there would be if hundreds of people met?

The probability that a passenger books a flight and does not turn up is 0.05. For an aeroplane with 400 seats how many tickets can be sold so that only 2% of flights are over-booked?

By sketching a graph of a continuous increasing function, can you prove a useful result about integrals?