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Math Help - Simple arithmetic in base 8

  1. #1
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    Simple arithmetic in base 8

    This problem has been solved. Thanks to all who helped.

    How do I *manually* (not use a calculator) multiply in a base other than 10, say base 8? Say I have 647(base 8) and 251(base 8) how do I multiply 647*251 and get the right answer in base 8?

    Seems like this should be real simple. But I get two answers depending upon how I do it.
    Last edited by MathGeezer; April 14th 2009 at 09:14 PM. Reason: Problem solved
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  2. #2
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    Here's a link that describes how to multiply in other bases:
    Multiplying numbers in bases other than 10 - Math Central

    And a multiplication table for base eight:
    Multiplication Tables for Other Bases

    I would just convert the numbers into decimal; it's easier with smaller numbers and less careless errors will probably be made.
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  3. #3
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    I think it would be easier for us to convert both the numbers into base 10 and reconvert the answer back in base 8.
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