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March 30, 2017

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Express the repeating decimal 0.513 (the 13 is repeating) as a fraction in lowest terms using the infinite geometric series method.

  • Math - ,

    .513= .510+ 3/1000 + 3.10000+ 3/1E5 +3/1E6+ ...

    notice that this is ...
    = .510+ 3/1000 (1+ (1/10)+ (1/10)^3+..)
    sum of
    = .510 + 3/1000(1/.9)=+510/1000+3/900

    = (510*9+300)/9000 check that
    = (4590+ 300) /9000 = 4890/9000=489/900

  • Math - ,

    the 1 and the there are repeating so it's .513131313131313... and 489/900 isn't giving me that. could you explain it again?

  • Math - ,

    what 9,000=900x_

  • Math - ,

    ed

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