How many zeros are in one billion (1,000,000,000)?
Answer9
A billion is 10 to the 9th power, written with nine zeros.
Challenge · Facts & stats
Billion facts & stats
7 fact-checked facts about big numbers, scale and what a billion really means, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
A gigabyte is roughly one billion of what?
AnswerBytes
Giga means a billion, so a gigabyte is about a billion bytes.
Going deeper
How is one billion written in scientific notation?
Answer10^9
One billion equals 1 × 10^9.
Earth is roughly how old?
AnswerAbout 4.5 billion years
Radiometric dating puts Earth's age at about 4.54 billion years.
The universe is estimated to be roughly how old?
AnswerAbout 13.8 billion years
Measurements of cosmic background radiation give about 13.8 billion years.
Expert level
The prefix 'nano' means what fraction?
AnswerOne billionth
Nano means 10 to the minus 9.
Roughly how far does light travel in one hour?
AnswerAbout 1.08 billion km
At about 300,000 km per second, light covers about 1.08 billion km per hour.
Know these cold?Today's round is five questions like these, 20 seconds each. Your streak and level follow you to every arena.Play today's round