Just Multiply

Algebra Level 3

Find the value of 123456789 x 999999999.


The answer is 123456788876543211.

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2 solutions

John Aries Sarza
Sep 1, 2014

ehmm this is not an interesting problem...

Tony Lowe
Sep 1, 2014

The way i decided to work this problem out was to do
123456789 X 999999999 =

123456789 X 1000000000 - (1 X 123456789) =

123456789000000000 - 123456789 =

123456788876543211

just that way ..

Kenneth Gravamen - 6 years, 9 months ago

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