Bar joke bad day

Cheers

There was this guy at a bar, just looking at his drink. He stays like that for half of an hour. Then, this big trouble-making truck driver steps next to him, takes the drink from the guy, and just drinks it all down. The poor man starts crying. The truck  ..

Proof n equals n plus one

Theorem n=n+1

N equals N plus one Theorem: n=n+1 Proof: (n+1)^2 = n^2 + 2*n + 1 Bring 2n+1 to the left: (n+1)^2 - (2n+1) = n^2 Substract n(2n+1) from both sides and factoring, we have: (n+1)^2 - (n+1)(2n+1) = n^2 - n(2n+1) Adding 1/4(2n+1)^2 to both sides yields: (n+1)^2 - (n+1)(2n+1) + 1/4(2n+1)^2 = n^2 - n(2n+1) + 1/4(2n+1)^2 This may  ..

Numbers equal zero

Calculate all numbers equal to zero

Theorem : All numbers are equal to zero. Proof: Suppose that a=b. Then a = b a^2 = ab a^2 - b^2 = ab - b^2 (a + b)(a - b) = b(a - b) a + b = b a = 0 Furthermore if a + b = b,   ..

Prime number

Largest prime number

Prime Number Interesting Numbers The largest prime number is 9,808,358 digits long; more than the number of atoms in the universe. Another sensationalist maths fact says: 2 and 5 are the only primes that end in 2 or 5. That is true for all decimal numbers for all known primes!   ..

What is amicable numbers

How to calculate amicable number

Amicable numbers are two different numbers so related that the sum of the proper divisors of one of the numbers is equal to the other. (A proper divisor of a number is a positive integer divisor other than the number itself. For example, the proper divisors of 6 are 1,  ..

Difference between c and ce on calculators

Online calculator

According to Vintage Technology, both buttons are a way to clear or cancel an entry. The C button will clear all input to the calculator. The CE button clears the most recent entry, so if you make a mistake in a long computation, you don't need to start all over  ..

Sudoku numbers based game

Number based math game

Sudoku is a numbers-based game. The rules are simple -- players attempt to fill in a nine-by-nine grid before going completely insane. Not surprisingly, these brainteasers owe their existence to a mathematician. Leonhard Euler is widely acknolwedged as the father of Sudoku. In 1793, Euler invented "Latin Squares," the precursor to  ..

Numbers after billion

Trillion - Quadrillion - googol

The names for larger numbers, based on the "short scale" where each value is a multiple of 1000: 1,000 X 1 trillion = 1 quadrillion (1015) 1,000 X 1 quadrillion = 1 quintillion (1018 ) 1,000 X 1 quintillion = 1 sextillion (1021) 1,000 X 1 sextillion = 1 septillion (1024) 1,000 X 1 septillion  ..

Confusing prime numbers

Other prime numbers

The prime number 73,939,133 has a very strange property. If you keep removing a digit from the right hand end of the number, each of the remaining numbers is also prime. It's the largest number known with this property. Take a look: 73,939,133 and 73,939,13 and 73,939,1 and 73,939 and  ..

Multiple and sub multiple units chart

Electronic calculation chart

PrefixSymbolMeaningPronounciationMegaMx 1,000,000 (106)meggerKilo K x 1,000 (103) keel-oh x1 milli m x 0.001 (10-3) millimicro ? x 0.000,001  ..

What is carat

Gold carat Calculation

What is carat? - Diamonds are weighed in carats. - A carat is equal to 0.2 grams, and is divided into 100 points, therefore a 25 point diamond = 1/4 or 0.25 carat. - The term carat is derived from carob seeds that were originally used to measure the weight of diamonds. -  ..

Unit chart multiple and submultiples units

Unit chart

This us an unit chat of Multiple and sub multiples units. FactorPrefixSymbol 1018 exa E 1015 peta P 1012 tera T 109 giga G 106 mega M 103 kilo k 102 hecto  ..

Shortcut for weight conversion

Simple weight conversions

Follow these easy formulas to convert pounds to kilograms: If the weight is from 10 to 99 lb, subtract the first number of the weight from the total weight and divide by two. Example: 26 lb: subtract 2 = 24; divide by 2 = 12 kg. 26 lb: subtract 2 = 24,  ..

Find the 9 digit number iq

Puzzle on numbers

Puzzle on numbers - Find the 9 digit number This is a math puzzle on numbers. Question Arrange the digits from 1 to 9 to make a 9-digit number ABCDEFGHI which satisfies the following conditions: 1) AB is divisible by 2. 2) ABC is divisible by 3. 3) ABCD is divisible by 4. 4) ABCDE is  ..

67 is a magic number

Magical numbers

magic Number 67 is a magic number,try it Last two digits( Last two digits (Number Given x 67) x 3 ) = Last two digits(Number Given) Example: Number 23 23 x 67 = 1541 , 41 x 3 = 123 = 23 Number 99 99 x 67 = 6633, 33 x 3 = 99 Number 8789 8789 x 67  ..