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59 interesting facts about Mathematics that will surprise, entertain and educate you.![]() A number is divisible by 9 if the sum of the digits is divisible by 9. ![]() The number zero does not have its own Roman numeral ![]() Think to yourself 'How I wish I could calculate pi' and then count the letters in each of the words of that sentence. You now have a way of remembering the first seven digits of pi: 3.141592. ![]() The first number to contain the letter a is 'one thousand'. See A NUMBER for the discussion behind this fact. ![]() The only number to have its letters in alphabetical order is forty. See Alphanumbetical and try to think of other alphanumbetical mathematical words! ![]() The numbers on opposite sides of a dice add up to seven. ![]() There are more than 64 squares on a chess board. If you count the squares made up of multiple squares there are 204 altogether. There is one 8x8 square, four 7x7 squares, nine 6x6 squares, 16 5x5 squares, 25 4x4 squares, 36 3x3 squares, 49 2x2 squares and 64 1x1 squares. ![]() A prime number has exactly two factors. Two is the only even prime number. ![]() It should take no more than 20 moves to solve a Rubiks cube no matter which of the 43 quintillion possible starting positions you begin with. ![]() A dodecahedron has twelve pentagonal sides. ![]() A googol is one followed by one hundred zeros. This can be written as: ![]() Not many people appreciate (or understand) the mind-blowing fact that: ![]() Triangles, squares and hexagons are the only regular polygons that tessellate. ![]() The equals sign was invented in 1557 by Welsh mathematician Robert Recorde. The word 'equal' is from the Latin word aequalis as meaning uniform, identical, or equal. ![]() 111111111 x 111111111 = 12345678987654321. ![]()
![]() Eight comes first if all the numbers are arranged alphabetically. What number would come last? ![]() More numbers begin with the digit one than any other digit. This result has been found to apply to a wide variety of data sets, including electricity bills, street addresses, stock prices, population numbers, death rates, lengths of rivers and mathematical constants. This fact was famously attributed to physicist Frank Benford, who stated it in 1938, although it had been previously stated by Simon Newcomb in 1881. ![]()
![]() 42 is the answer to the 'Ultimate Question of Life, the Universe, and Everything' according to 'The Hitchhiker's Guide to the Galaxy' created by Douglas Adams. ![]() 18 is the only number that is twice the sum of its digits. ![]() Most clocks which have Roman numerals on their face use IIII for four instead of the more familiar IV. ![]() There are currently over 7 billion people in the world and the number is growing very quickly. To see just how quickly have a look at our population counter. ![]() Any number to the power zero is 1, and zero to any power is 0. The only unanswered question here is what is zero to the power zero? ![]() The Fibonacci sequence is a sequence of numbers where each term is the sum of the previous two terms. The first two terms are both one. The ratio of the nth term to the next term gets closer to the golden ratio as n increases. ![]() Air France, Iberia, Ryanair, AirTran, Continental Airlines, and Lufthansa don’t have a row 13 on their airlines because they are aware that many of their passengers consider 13 to be an unlucky number. Many office blocks, office buildings and hotels do not have a 13th floor for the same reason. ![]() The following three consecutive numbers are the lowest that are divisible by cubes other than 1: ![]() The digits of the number are the same as the digits of the power of ten in these cases:
![]() The polar diameter of the Earth is quite close to (within 0.1%) half a billion inches. ![]() The first time a digit repeats six times in succession in pi is at the 762nd position where you can find six nines in a row. This is known as the Feynman Point. ![]() The term googol (a 1 followed by 100 zeroes) was first used by a 9- year old boy,Milton Sirotta, in 1938. Trivia submitted by Paul Christian Sarmiento, Philippines ![]() As weird as it may seem at first glance, f(x) = -1/(x+1) and g(x) = x/(x+1) have the same derivative. Trivia submitted by Shiraz Dagia, Malawi ![]() A number if multiply by 11 is just you bring down the last digits add the digit to the number on it's left and bring down the first number. Trivia submitted by Jericho Fernandez, Laguna, Philippines ![]() There is a number smaller than 'a thousand' or 'a hundred and one' with the letter a - it is any number like 0.001 or 'one thousandth' which is smaller than 101 or 1000. These decimals can get infinitely smaller so the proper term for the trivia should be that the smallest whole number not just the smallest number. Trivia submitted by QA, Makaben ![]() You can remember the value of Pi (3.1415926) by counting each word's letters in Trivia submitted by Ms. Prescott, ![]() Trivia improves critical thinking. Trivia submitted by Wisani, Gauteng, South Africa ![]() A googolplex is a googola googol, or (10100) to the power(10100). Trivia submitted by Anonymous, Planet Earth ![]() 40 when written in words "forty" is the only number with letters in alphabetical order, while one is the only one with letters in reverse order. Trivia submitted by Dustin Joseph C. Manalo, Bulacan,Philippines ![]() The number 0 is originally called cipher. Trivia submitted by Paras, Philipines ![]() The billionth digit of Pi (3.1415 ...) is 9. Trivia submitted by Joy, Manila, Philippines ![]() What is the correct mathematical name of the division bar in a fraction?
Trivia submitted by Lovely Tinam-isan, Muntinlupa, Philippines ![]() The term "jiffy" is an actual unit of time which is the 1/100th of a second. Trivia submitted by Josh Anilov C. Funelas, Manila, Philippines ![]() The value of zero was first used by the ancient Indian mathematician Aryabhata. Trivia submitted by Wency Orbina, Philippines ![]() 2520 is the smallest number that is divisible by 1,2,3,4,5,6,7,8,9 and 10. Trivia submitted by MathWizard, Phillipines ![]() Moving each letter of the word 'yes' 16 places further up the alphabet produces the word 'oui', the French for 'yes'. Trivia submitted by Greg Ross, Futility Closet ![]() Forty-two percent of Slovenian two-year-olds know the number two, while only four percent of English two-year-olds do. Trivia submitted by Francie Diep, Popular Science ![]() The word 'twelve' is worth 12 points in Scrabble. . Trivia submitted by Greg Ross, Futility Closet ![]() The words 'ace, two, three, four, five, six, seven, eight, nine, ten, jack, queen, king' contain 52 letters. There are 52 cards in a pack (excluding jokers). Trivia submitted by Greg Ross, Futility Closet ![]() If you square11111111 the answer would be 123456787654321. (count the number of 1s and that's the middle number). Trivia submitted by Ranz Louie Ricasa, Philippines ![]() The polygon with 1000000 sides is called megagon. Trivia submitted by Ranz Louie Ricasa, Philippines ![]() 99*99=9801 Trivia submitted by Ranz Louie Ricasa, Philippines ![]() If you find the difference between the number of edges and the number of faces of the tetrahedron, cube, octahedron and other solid shapes, the results will always be 2. Trivia submitted by Ranz Louie Ricasa, Olongapo City,Philippines ![]() The second hand on a clock is actually the minute hand. Trivia submitted by Will, Northampton, England ![]() If you write out pi to two decimal places, backwards it spells “pie”. Trivia submitted by Me, England ![]() The Reuleaux Triangle is a shape of constant width, the simplest and best known such curve other than a circle. Trivia submitted by Manuel Henryk Fabunan, Philippines That's 56 interesting and surprising facts but there could be more! Do you know any mathematical trivia that could be added to this page? Click here to enter your information. |
Equilateral Triangle
Number of sides: 3Angle sum: 180oInterior angle: 60oExterior angle: 120o
Square
Number of sides: 4Angle sum: 360oInterior angle: 90oExterior angle: 90o
Pentagon (regular)
Number of sides: 5Angle sum: 540oInterior angle: 108oExterior angle: 72o
Hexagon (regular)
Number of sides: 6Angle sum: 720oInterior angle: 120oExterior angle: 60o
Heptagon (regular)
Number of sides: 7Angle sum: 900oInterior angle: 129oExterior angle: 51o... to the nearest degree.
Octagon (regular)
Number of sides: 8Angle sum: 1080oInterior angle: 135oExterior angle: 45o
Nonagon (regular)
Number of sides: 9Angle sum: 1260oInterior angle: 140oExterior angle: 40o
Decagon (regular)
Number of sides: 10Angle sum: 1440oInterior angle: 144oExterior angle: 36o
Undecagon (regular)
Number of sides: 11Angle sum: 1620oInterior angle: 147oExterior angle: 33o... to the nearest degree.
Dodecagon (regular)
Number of sides: 12Angle sum: 1800oInterior angle: 150oExterior angle: 30o
Tridecagon (regular)
Number of sides: 13Angle sum: 1980oInterior angle: 152oExterior angle: 28o... to the nearest degree.
Tetradecagon (regular)
Number of sides: 14Angle sum: 2160oInterior angle: 154oExterior angle: 26o... to the nearest degree.
Pentadecagon (regular)
Number of sides: 15Angle sum: 2340oInterior angle: 156oExterior angle: 24o... to the nearest degree.
Hexadecagon (regular)
Number of sides: 16Angle sum: 2520oInterior angle: 158oExterior angle: 23o... to the nearest degree.
Heptadecagon (regular)
Number of sides: 17Angle sum: 2700oInterior angle: 159oExterior angle: 21o... to the nearest degree.
Octadecagon (regular)
Number of sides: 18Angle sum: 2880oInterior angle: 160oExterior angle: 20o... to the nearest degree.
Enneadecagon (regular)
Number of sides: 19Angle sum: 3060oInterior angle: 161oExterior angle: 19o... to the nearest degree.
Icosagon (regular)
Number of sides: 20Angle sum: 3240oInterior angle: 162oExterior angle: 18o... to the nearest degree.
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Metric and ImperialApproximate Equivalents
1 mile = 1.6 km1 metre = 39.37 inches1 foot = 30.5 cm1 inch = 2.54 cm1 kg = 2.2 lb1 gallon = 4.5 litres1 litre = 1.75 pints
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Metric Prefixes
mega M 1000000 millionkilo k 1000 thousandhecto h 100 hundreddeca da 10 ten1 onedeci d 0.1 tenthcenti c 0.01 hundredthmilli m 0.001 thousandthmicro μ 0.000001 millionth
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Four is the only number that has the same number of letters as its meaning
F,O,U,R.