Tutorial 21 |
Multiply any no with 9,99,999,9999
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example1 - 18 * 99 step 1- put 2 zeros after 18 (as we have to mul it by 99, and 99 has 2 digits)
it becomes 1800 now
step 2- now subtract 18 from 1800 ans is 1782
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example2- 482*9999
step1- put 4 zeros after 482 (as we have to mul 482 by 9999, and 9999 has 4 digits)
it becomes 4820000
step 2- subtract 482 from 4820000
ans is 4819518
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