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Which numeral system was in use in ancient Sumer and Babylon?

Sexagesimal. Remnants of the highly composite sexagesimal system are in use even today for time measurement and geometry. An hour of time is divided into 60 minutes, which in turn are divided into 60 seconds.

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wikipedia → Sexagesimal#Modern usage

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Which number is considered unlucky in East Asia?

4. Words "four" and "Death" have very similar pronunciation in Chinese, Vietnamese, Korean and Japanese. In East Asia many buildings do not have a 4th floor. Some high-rise residential buildings omit all floor numbers with "4", e.g., 4, 14, 24, 34 and all 40–49 floors.

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South Korea facts

What is the sum of all the numbers on the roulette wheel?

666. This fact contributed to the naming of the game as "game of Satan", since 666 it is called the number of the beast by the Book of Revelation.

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wikipedia → Roulette

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What’s the distance between Russia and the U.S. at their closest point?

4 km (2.5 miles). Although the Strait’s narrowest point is about 53 miles (85 km) wide, there are two islands in its center, Little Diomede (U.S.) and Big Diomede (Russia), which bring the distance of these two nations only 2.5 (4 km) miles apart at their closest point.

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USA facts

What is the sum of all even numbers between 1 and 100?

5050. 1+2+...+99+100 = 1+100+2+99+...+50+51 = 101+101+101+...+101 = 101*50 = 5050 It's a calculation method invented by Gauss.

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Which currency was the first to be converted to the decimal system?

Russian ruble. The new ruble, introduced by the monetary reform of Peter the Great in 1704, was the first currency based on the decimal system.

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wikipedia → Russian ruble

coins facts

What is ten to the power of one hundred called?

Googol. The name of the Google search engine was created by mistake of its creator, L. Page, who meant googol.

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internet facts

What is the largest integer ever used in a mathematical proof?

Graham's number is an enormous number that arises as an upper bound on the answer of a problem in the mathematical field of Ramsey theory. The number was published in the 1980 Guinness Book of World Records, adding to its popular interest.

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wikipedia → Graham's number

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How much of the Earth's ice is in Antarctica?

About 90% of terrestrial ice is found in Antarctica.

ice facts

Which of the following Roman numerals stands for 4?

Both IV and IIII. Both notations are correct and historically Roman numerals were often written less consistently than today. The notation 'IIII' is often seen on clock faces. The reason for that may be practical, to avoid confusing the IV and VI when the clock is held upside down (although other theories also exist).

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