- 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.
- 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 = 0·027027027... and 1 ÷ 27 = 0·037037037...
- 1/1089 = 0·00091827364554637281... (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. (Thank goodness!)
- The number FOUR is the only number in the English language that is spelt with the same number of letters as the number itself
- 1x9 +2 = 11 , 12x9 +3 = 111 , 123x9+4 = 1111 and so on.
Tuesday, June 2, 2009
The Most Pathetic Fact in Maths
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