Some of the numbers have fallen off Becky's number line. Can you figure out what they were?
Construct two equilateral triangles on a straight line. There are two lengths that look the same - can you prove it?
The items in the shopping basket add and multiply to give the same amount. What could their prices be?
Under what circumstances can you rearrange a big square to make three smaller squares?
Take a triangular number, multiply it by 8 and add 1. What is special about your answer? Can you prove it?
These Stage 3 and 4 problems have not yet been solved. Can you be the first?