When is it impossible to make number sandwiches?
How did the the rotation robot make these patterns?
Can you use small coloured cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of each colour?
Five equations... five unknowns... can you solve the system?
By sketching a graph of a continuous increasing function, can you prove a useful result about integrals?
Can you work out the irrational numbers that belong in the circles to make the multiplication arithmagon correct?
Use graphs to gain insights into an area and perimeter problem, or use your knowledge of area and perimeter to gain insights into the graphs...
What do you get when you raise a quadratic to the power of a quadratic?