Amazing Number Facts
| 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. |
| 69 squared = 4761 and 69 cubed = 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... |
13 to the power of 2 = 169 and if you write both numbers backwards you get 31 to the power of 2 = 961.
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| 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!) |
| 1x9 +2 = 11 , 12x9 +3 = 111 , 123x9+4 = 1111 and so on. |