# 10 Things You Didn’t Know About Math!

- Did you know that 0.999…is equal to 1? Mind–boggling… but here is an example to prove it:
- ‘FOUR’ is the only number in the English language that is spelt with the same number of letters as the number itself.
- Americans called mathematics ‘math’, arguing that ‘mathematics’ functions as a singular noun so ‘math’ should be singular too.
- From number 0 to 1000, the letter ‘A’ only appears in 1000 – ‘one thousand’
- Among all shapes with the same perimeter a circle has the largest area. (Want to practice geometry? Click here!)
- We all know that primes are numbers that can only be divided by themselves and 1 (such as 2,3,5,7, etc). But what would be the highest prime number you can think of? The largest prime number known so far is 2
^{57,885,161}-1, a 17,425,170 digit number. The new largest-known prime is the third discovered by Curtis Cooper of the University of Central Missouri, who was running Gimps software on 1,000 university computers. It took one of the PCs 39 days of non-stop computing to check it was indeed prime. - The sum of the digits of the number added to 9 is always equal to the sum of the digits of the result. Take any four digit number and try it!
- The easiest way to remember the value of Pi (3.1415926) is by counting each word’s letter in ‘May I have a large container of coffee’
- The equal sign ‘=’ was invented by an English mathematician in 1557. In his book Robert Recorde explains: ‘…to avoid the tedious repetition of these words: “is equal to”, I will set (as I do often in work use) a pair of parallels, or Gemowe lines, of one length (thus =), because no two things can be more equal.’
- The only number in English that is spelled with its letters in alphabetical order is ‘forty’.

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