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Four friends must cross a bridge. How can they all cross it in just 17 minutes?

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?

Things are roughened up and friction is now added to the approximate simple pendulum

Is there an efficient way to work out how many factors a large number has?

In the café, your ice cream selection can't include a combination that someone else has chosen. What could these seven children have chosen?

Explore some of the different types of network, and prove a result about network trees.

Watch these videos to see how Phoebe, Alice and Luke chose to draw 7 squares. How would they draw 100?

Aisha's division and subtraction calculations both gave the same answer! Can you find some more examples?

The number in the square is the mean of the four numbers surrounding it. Can you find the missing numbers? 

This activity is based on data in the book 'If the World Were a Village'. How will you represent your chosen data for maximum effect?