This is part of our collection of favourite rich tasks arranged by topic.
If you are a teacher, you can find the whole collection on our Secondary Curriculum teacher page.
Alternatively, if you are a student, you'll find the same problems on our Secondary Curriculum student page.
In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?
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?
Is there a temperature at which Celsius and Fahrenheit readings are the same?
There are lots of different methods to find out what the shapes are worth - how many can you find?
Four friends must cross a bridge. How can they all cross it in just 17 minutes?
