The numerical digits we use today such as 1, 2 and 3 are based on the
Hindu-Arabic numeral system developed over 1000 years ago.
The smallest ten prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23 and
29.
2 and 5 are the only prime numbers that end with a 2 or a 5.
The number Pi (the ratio of the circumference to the diameter of a
circle) can’t be expressed as a fraction, making it an irrational number. It
never repeats and never ends when written as a decimal.
Here is Pi written to 100 decimal places:
3.1415926535897932384626433832795028841971693993751
058209749445923078164062862089986280348253421170679
What comes after a million, billion and trillion? A quadrillion,
quintillion, sextillion, septillion, octillion, nonillion, decillion and
undecillion.
The name of the popular search engine ‘Google’ came from a misspelling
of the word ‘googol’, which is a very large number (the number one followed by
one hundred zeros to be exact).
A ‘googolplex’ is the number 1 followed by a googol zeros, a number so
ridiculously big that it can’t be written because there literally isn't enough
room in the entire universe to fit it in!
You might have heard the word ‘infinity’ before or seen its symbol that
looks like the number 8 placed on its side. Infinity means a limitless quantity
or something that goes on forever. While it’s not really a number like 1, 2 or
3, infinity is often used in math as part of equations and formulas.
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