How many zeros are in one million?
Answer6
One million is written 1,000,000.
Challenge · Facts & stats
Number facts & stats
7 fact-checked facts about numbers, math facts and number puzzles, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What number does the Roman numeral C represent?
Answer100
C stands for 100, from the Latin centum.
Going deeper
In the Fibonacci sequence 1, 1, 2, 3, 5, 8, what comes next?
Answer13
Each term is the sum of the two before it: 5 plus 8 is 13.
Which of these is a perfect number?
Answer28
28 equals the sum of its proper divisors: 1, 2, 4, 7 and 14.
What is the square root of 144?
Answer12
12 times 12 is 144.
Expert level
Euler's number e is approximately what?
Answer2.718
e, the base of natural logarithms, is about 2.71828.
Which number is famous as the smallest sum of two cubes in two different ways?
Answer1729
1729 equals 1 cubed plus 12 cubed and 9 cubed plus 10 cubed.
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