Can you make five differently sized squares from the interactive tangram pieces?...

Can you design your own version of the Olympic rings, using interlocking squares instead of circles?...

On a digital clock showing 24 hour time, over a whole day, how many times does a 5 appear? Is it the same number for a 12 hour clock over a whole day?...

A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target....

This activity focuses on doubling multiples of five....

How many solutions can you find to this sum? Each of the different letters stands for a different number....

How many ways can you find to do up all four buttons on my coat? How about if I had five buttons? Six ...?...

Can you do a little mathematical detective work to figure out which number has been wiped out?...

Can you explain the strategy for winning this game with any target?...

This interactivity invites you to make conjectures and explore probabilities of outcomes related to two independent events....