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msth 115

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help multiply and use simplest form 4 1/5*10/21*9/20

  • msth 115 -

    21/5 *10/21 *9*20

    The twenty-ones divide out.
    The 10/20 reduces to 1/2, leaving,

    1/5*9/2 which is 9/10

    check me.

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