Four bags contain a large number of 1s, 3s, 5s and 7s. Can you pick any ten numbers from the bags so that their total is 37?
When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...
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.
Explore when it is possible to construct a circle which just touches all four sides of a quadrilateral.
What can you say about these shapes? This problem challenges you to create shapes with different areas and perimeters.
Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?
