This is part of our Secondary Curriculum collection of favourite rich tasks arranged by topic.
Scroll down to see the complete collection, or explore our subcollections on Perimeter and Area in two dimensions, and Surface Area and Volume in three dimensions.
problem
Favourite
Fruity totals
Age
7 to 16
Challenge level
In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?
problem
Favourite
What's it worth?
Age
11 to 16
Challenge level
There are lots of different methods to find out what the shapes are worth - how many can you find?
problem
Favourite
Your number was...
Age
11 to 14
Challenge level
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
Favourite
Temperature
Age
11 to 14
Challenge level
Is there a temperature at which Celsius and Fahrenheit readings are the same?
problem
Favourite
Crossing the Bridge
Age
11 to 18
Challenge level
Four friends must cross a bridge. How can they all cross it in just 17 minutes?
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You may also be interested in this collection of activities from the STEM Learning website, that complement the NRICH activities above.