When is $7^n + 3^n$ a multiple of 10? Can you prove the result by two different methods?
Which is the bigger, 9^10 or 10^9 ? Which is the bigger, 99^100 or 100^99 ?
How can we make sense of national and global statistics involving very large numbers?
Infographics are a powerful way of communicating statistical information. Can you come up with your own?
How well can you estimate 10 seconds? Investigate with our timing tool.