

problem
Your number was...
Think of a number and follow my instructions. Tell me your answer, and I'll tell you what you started with! Can you explain how I know?

problem
What's it worth?
There are lots of different methods to find out what the shapes are worth - how many can you find?

problem
Fruity totals
In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?