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Top 10 numbers facts

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Numbers quiz
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.
Sumit Tamang
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5
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South Korea facts
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.
 smyru
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wikipedia → Sexagesimal#Modern usage
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mathematics 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.
 smyru
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wikipedia → Roulette
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games facts
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.
 grifi bastion
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www.uselessdaily.com
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USA facts
Typically, how many leap years are in a century? 24.
The Gregorian Calendar omits 3 leap days every 400 years, omitting February 29 in the 3 century years (integer multiples of 100) that are not also integer multiples of 400. For example, 1600 was a leap year, but 1700, 1800 and 1900 were not. Similarly, 2000 was a leap year, but 2100, 2200, and 2300 will not be.
 ex-terminator
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math facts
Globalquiz is a hard trivia game.
After playing some quizzes, you will get detailed results about your strenghts and weaknesses.
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Which of the following is a prime number? 16769023.
A prime number has no positive divisors other than 1 and itself. Hence, a prime bigger than 2 cannot be even. All prime numbers bigger than 5, written in the usual decimal system, end in 1, 3, 7, or 9.
Sumit Tamang
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math facts
Which of the following numbers is the greatest? 1/3.
Quite surprisingly, most players answer that both answers 1/3 and 33% are correct. But 1/3 is more than 33%. (it is 33.3333333...)
 globalquiz.org
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maths facts
What is the result of 2+2*2? 6
The multiplication has a priority over addition, and so the result is 2+(2*2) = 2+4 = 6.
 Paweł Kołodziejczyk
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wikipedia → Order of operations
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mathematics facts
What is the volume of a soap bubble with radius R=1 cm? 4/3π cm3.
Equation for the volume of a sphere: 4/3πR^3.
 Paweł Kołodziejczyk
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wikipedia → Volume of an n-ball
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geometry facts
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.
 smyru
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wikipedia → Russian ruble
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coins facts
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