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how do you do the following? 9/10 - ?= 17/30 and 3/10 + 4/5 = ? first time doing this . Thank you

  • math -

    To add and subtract fractions, they need to have the same denominator.

    9/10 - ?= 17/30

    - x = 17/30 - 9/10

    -x = 17/30 - 27/30

    x = 10/30 = 1/3
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    3/10 + 4/5 = ?

    3/10 + 8/10 = 11/10 = 1 1/10

    http://www.math.com/school/subject1/lessons/S1U4L3GL.html

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