Can you find the values at the vertices when you know the values on the edges?
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?
Choose four consecutive whole numbers. Multiply the first and last numbers together. Multiply the middle pair together. What do you notice?
Have a go at creating these images based on circles. What do you notice about the areas of the different sections?
Explore when it is possible to construct a circle which just touches all four sides of a quadrilateral.
Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?
Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make?
