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Question

Solve mentally.

1,00,000-8999


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Solution

Given numerical expression is 1,00,000-8999

Replace every zero from the left with 9 and the last zero with a 10

100000|||||999910

Now subtract each digit from 9 and last digit from 10

999910-899991001¯

Hence, the value of 1,00,000-8999 is 91001


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