10 Math/Number Facts (Vol. #4)

1. Harvard Professor Oliver Knill who has indexed clips from approximately 150 movies featuring mathematics. You can have a look at the list here

2. When website owner of 3.141592653589793238462643383279502884197169399375105820974944592.com has to move page containing 'Pi to one MILLION decimal places' to random index page because servers were getting down by frequent visits by math nerds.

3. 0.999… is the same as 1. Not just very close, but precisely identical:

     a = 0.999…
     10a = 9.999…
     10a – a = 9.999… – 0.999…
     9a = 9
     a = 1

4. Triangle Dissection Paradox or Missing square puzzle : If you rearrange blocks of first triangle and make second triangle out of it, you will get remaining 1x1 block in second figure.
To find out how it happened, look at the Wikipedia page

5. $1,741,725=1^7+7^7+4^7+1^7+7^7+2^7+5^7$

6. Novemnonagintillion : Ever wonder what a number with 300 zeros after one is called? No? Well who asked you anyway? Actually, it's called a novemnonagintillion . To have a look at the list of names of big number visit BigNumbers

7. Amazing properties of number 9:

      12345679 x 9 = 111,111,111

      111,111,111 x 111,111,111 = 12345678987654321

      1/9 = 0.11111....

8. Rotating number 142857:

      142857 x 2 = 285714

      142857 x 3 = 428571

      142857 x 4 = 571428

      142857 x 5 = 714285

      142857 x 6 = 857142

      And 1/7 = 0.142857...

9. 5141 is the only four digit number that is reversed in hexadecimal.

      5141 = 0x1415

10. 88 + 88 + 58 + 98 + 38 + 48 + 78 + 78 = 88593477

Also have a look at : Vol#3, Vol#2 and Vol#1