Some interesting facts about mathematics.

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Offline sayma

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Some interesting facts about mathematics.
« on: May 25, 2013, 12:41:02 PM »
•   The word 'mathematics' comes from the Greek máthēma, which means learning, study, science.
•   What comes after a million, billion and trillion? A quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion and undecillion.
•   Different names for the number 0 include zero, nought, naught, nil, zilch and zip.
•   Zero ( 0 ) is the only number which can not be represented by Roman numerals.
•   The name 'zero' derives from the Arabic word sifr which also gave us the English word 'cipher' meaning 'a secret way of writing' .
•   Do you know the magic of no. nine (9)? Multiply any number with nine (9 ) and then sum all individual digits of the result (product) to make it single digit, the sum of all these individual digits would always be nine (9).
•   Here is an interesting trick to check divisibility of any number by number 3.A number is divisible by three if the sum of its digits is divisible by three (3).
•   The = sign ("equals sign") was invented by 16th Century Welsh mathematician Robert Recorde, who was fed up with writing "is equal to" in his equations.
•   Googol (meaning & origin of Google brand ) is the term used for a number 1 followed by 100 zeros and that it was used by a nine-year old, Milton Sirotta, in 1940.
•   The name of the popular search engine ‘Google’ came from a misspelling of the word ‘googol’.
•   Abacus is considered the origin of the calculator.
•   Have you ever noticed that the opposite sides a die always add up to seven (7).
•   Equal sign (=) was first used in 1557 by Robert Recorde, an Englishman.
•   12,345,678,987,654,321 is the product of 111,111,111 x 111,111,111. Notice the sequence of the numbers 1 to 9 and back to 1.
•   Plus (+) and Minus (-) sign symbols were used as early as 1489 A.D.
•   An icosagon is a shape with 20 sides.
•   Trigonometry is the study of the relationship between the angles of triangles and their sides.
•   If you add up the numbers 1-100 consecutively (1+2+3+4+5...) the total is 5050.
•   2 and 5 are the only primes that end in 2 or 5.
•   From 0 to 1,000, the letter "A" only appears in 1,000 ("one thousand").
•   A 'jiffy' is an actual unit of time for 1/100th of a second.