## Number Patterns

Posted May 1st, 2009 by alpha

1) 1 x 1 =1

11 x 11 =121

111 x 111=12321

1111 x 1111=1234321

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2) When we multiply the number 12345679 by any 2-digit number which is the multiple of 9 [NOTE: UP TO 81] the result is a 9 digit number consisting of 1 digit repeated.

the repeating digit is the number of times 9 divides the 2 digit multiple.

For example

12345679 x 45=555555555

45/9=5