There are lots of ways to climb a staircase, taking one or two steps at a time. Explore this and related problems, and find out about some special number sequences.

I wonder if there's a different way to climb 13 steps for each day of the year... Solving this problem might lead you to a famous number sequence.

I wonder if there's a different way of feeding the car park machine for each day of the year... and what's it got to do with climbing stairs?

Is there a quick way to work out the number of different ways to go up staircases if I can take giant steps?

Explore how repeating simple calculations can quickly lead to chaos.

Meet the man behind the Fibonacci sequence

Discover some of the surprising places you'll find the Fibonacci sequence