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Mathematics Facts & Trivia

A dollar can be made into small change in 293 ways.

PiYou can remember the value of Pi (3.1415926) by counting each word's letters in "May I have a large container of coffee?" Sciensational.com

Multiplication and succession:

  1 × 8 + 1 = 9
 12 × 8 + 2 = 98
123 × 8 + 3 = 987
and so on.

142857 is a cyclic number, i.e., its digits are rotated around when multiplied by any number from 1 to 6. Like this:

142857 × 1 =  142857 
142857 × 5 = 7 14285
142857 × 4 = 57 1428
142857 × 6 = 857 142
142857 × 2 = 2857 14
142857 × 3 = 42857 1
Sciensational.com

1089 multiplied by 9 gives an exact reverse: 9801.

From 0 to 1,000, the letter "A" only appears in 1,000 ("one thousand"). Sciensational.com

2 is called the "oddest" Even Prime-number. 2 is a unique Even Prime because all Even-numbers are divisible by 2. But any number apart from 2 that is divisible by 2, is not a Prime.

  1 × 9 + 2 = 11
 12 × 9 + 3 = 111
123 × 9 + 4 = 1111
... and so on. Sciensational.com

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

1 googol = 10100;
1 googolplex = 10googol = 1010100 . Sciensational.com

111 111 111 x 111 111 111 = 12345678 9 87654321

Pi (3.14159...) is a number that cannot be written as a fraction. Sciensational.com

The opposite sides of a dice cube always add up to seven.

21978 when multiplied by 4 is the same number with digits in reverse order: 21978 x 4 = 87912

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

The billionth digit of Pi is 9.

1 and 2 are the only numbers where they are the values of the numbers of factors they have.

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

The largest prime number is 9,808,358 digits long; more than the number of atoms in the universe.

The digits to the right of the Pi's (3.141...) decimal point can keep going forever, and there is no pattern to these digits at all.