Magic In Mathematics

Here is an interesting trick you can show friends, First take a sheet of a paper and write on it the magic number 12345679. It is easy to remember this number because there are all figures in it form 1 to9; only number 8 is not there
Now ask a friend to tell you his favorite figure. Multiply the figure which he is going to tell by 9 in your head. Write the answer under the magic number. For example, if he tells you that his favorite number is 3, you write 27 under the magic number. Then ask him to multiply 12345679 by 27. the answer will surprise him, because there will be only 3's in it-it is his favorite figure . The trick words works with any figure. Try it and see.