## Some information about mathematics

**1.**Zero ( 0 ) is the only number which can not be represented by Roman numerals a.

**2.**What comes after a million, billion and trillion? A quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion and undecillion a

**3.**Plus (+) and Minus (-) sign symbols were used as early as 1489 A.Da

**4**. 2 and 5 are the only primes that end in 2 or 5

**5**. An icosagon is a shape with 20 sidesa

**6.**Among all shapes with the same perimeter a circle has the largest area.

**7.**Among all shapes with the same area circle has the shortest perimeter

**8.**40 when written "forty" is the only number with letters in alphabetical order, while "one" is the only one with letters in areverse order

**9.**'FOUR' is the only number in the English language that is spelt with the same number of letters as the number itselfa a

**10.**From 0 to 1,000, the letter "A" only appears in 1,000 ("one thousand")a

**11.**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.

**12.**Have you ever noticed that the opposite sides a die always add up to seven (7)

**13.**Trigonometry is the study of the relationship between the angles of triangles and their sides

**14.**Abacus is considered the origin of the calculatora

**15.**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)

**16.**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)a.

**17.**If you add up the numbers 1-100 consecutively (1+2+3+4+5...) the total is 5050

**18.**A 'jiffy' is an actual unit of time for 1/100th of a seconda

**19.**Have you heard about a Palindrome Number? It is a number that reads the same backwards and forward, e.g. 12421a

**20.**Have you heard about Fibonacci? aIt is the sequence of numbers wherein a number is the result of adding the two numbers before it! Here is an example: 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on

**More topics ..............**

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