Type a number: 3500, 2.5 million, 4e9…
Source:
One question a day. Estimate the number in six guesses.
After each guess you learn which way to go and roughly how far off you are:
Type numbers however you like: 4200, 4,200, 2.5 million, 3e9, 10^20.
4200
4,200
2.5 million
3e9
10^20
A new question appears at midnight. Every answer comes with its source.
Practise on earlier questions. They don't count towards your streak.