How Fast? How Big? The Number-Guessing Quiz

No multiple choice here: drag the slider as close as you can. Speeds, heights, distances and sizes from animals, planets and the human body. Closer guesses earn more points, and being just inside the margin still counts. Ten questions, about 9 minutes. All values are well-established round figures.

Questions

Answers stay hidden until you play.

1. A cheetah's top speed over a short sprint is about how fast?
2. How tall is Mount Everest above sea level?
3. How far is the Moon from Earth, on average?
4. The longest blue whales reach roughly how many metres in length?
5. How fast does sound travel through air at room temperature?
6. How many bones does an adult human have?
7. Roughly how deep is the deepest known point of the ocean, the Challenger Deep?
8. About how many minutes does sunlight take to reach Earth?
9. Which is the largest land animal alive today?
10. Order these from SMALLEST to LARGEST by diameter.