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Posted by on Sunday, August 26, 2007 at 5:34pm.

what is 999999999999999999 times 9999?

  • math - , Sunday, August 26, 2007 at 5:40pm

    What do you think the answer is? We'll be glad to check your answer if you post it here.

  • math - , Sunday, August 26, 2007 at 5:44pm

    999999999999999999 =

    10^18 - 1

    9999 = 10^4 - 1

    999999999999999999 * 9999 =

    (10^18 - 1)* (10^4 - 1) =

    10^22 - 10^18 - 10^4 + 1

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