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  • multiplication by all 9's

    aditi

    Member

    Updated: Oct 21, 2024
    Views: 1.2K
    Multiplication by all 9's wherein multiplicant being of equal no. of digits as of multiplier. Solved eg below.

    2148 * 9999 = 21477852 - This is solved just in fraction of seconds... How????

    Reduce the number 2148 by 1 (2147) which is left part of answer. For next 4 digits write the complementary numbers from 9 in the same order of 2147 i.e 7852 ( i.e 9-2, 9-1, 9-4 & 9-7)
    :smile:
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  • Neha

    MemberAug 10, 2006

    Thats great!!!

    Looking forward for some more.
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