number facts

find some ridiculus facts about numbers
e.g.19=1*9+1+9
29=2*9+2+9
39=3*9+3+9
49=4*9+4+9
annd so on until99

Also,

320001-100032 is divisible by 9
200-002 is divisble by 9
932-239 is divisible by 9

And so on for any positive integer.

21978*4=87912
10112359550561797752808988764044943820224719*9=put 9 at the front 1=1^2*1^3
4=2^2*1^3.......
the 359,360,361 decimal place ofpi is 3,6,0

If you multiply 1089 x 9 you get 9801. It's reversed itself! This also works with 10989 or 109989 or 1099989 and so on. 1 is the only positive whole number that you can add to 1,000,000 and you get an answer that's bigger than if you multiply it by 1,000,000 19 = 1 x 9 + 1 + 9 and 29 = 2 x 9 + 2 + 9. This also works for 39,49,59,69,79,89 and 99. 153, 370, 371 and 407 are all the "sum of the cubes of their digits". In other words 153=13+53+33 If you divide any square number by 8 you get a remainder of 0, 1 or 4. 2 is the only number that gives the same result added to itself as it does times by itself If you multiply 21978 by 4 it turns backwards There are 12,988,816 different ways to cover a chess board with 32 dominoes. Sixty nine squared = 692 = 4761 and sixty nine cubed = 693 = 328509. These two answers use all the digits from 0 to 9 between them. You can chop a big lump of cheese into a maximum of 93 bits with 8 straight cuts In the English language "forty" is the only number that has all its letters in alphabetical order. 1 ?37 = 0?27027027... and 1 ?27 = 0?37037037... 132 = 169 and if you write both numbers backwards you get 312 = 961. This also works with 12 because 122 = 144 and 212 =441. 1/1089 = 0?0091827364554637281... (And the numbers in the 9 times table are 9,18,27,36...) 8 is the only cube that is 1 less than a square. To multiply 10,112,359,550,561,797,752,808,988,764,044,943,820,224,719 by 9 you just move the 9 at the very end up to the front. It's the only number that does this.

You can find them in this website:

http://www.murderousmaths.co.uk/books/bkmm8xpf.htm