Your Solutions - Stage 4 & 5

Tens

Stage: 5 Challenge Level: Challenge Level:2 Challenge Level:2

When is $7^n + 3^n$ a multiple of 10? Can you prove the result by two different methods?

Giants

Stage: 5 Challenge Level: Challenge Level:2 Challenge Level:2

Which is the bigger, 9^10 or 10^9 ? Which is the bigger, 99^100 or 100^99 ?

Picturing the World

Stage: 3 and 4 Challenge Level: Challenge Level:1

How can we make sense of national and global statistics involving very large numbers?

Perception Versus Reality

Stage: 4 and 5 Challenge Level: Challenge Level:1

Infographics are a powerful way of communicating statistical information. Can you come up with your own?

Estimating Time

Stage: 3, 4 and 5 Challenge Level: Challenge Level:1

How well can you estimate 10 seconds? Investigate with our timing tool.