More than Two Fractions

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  • March 8, 2014 at 3:57 pm #2737
    lhwalker
    Participant

    When do students start adding more than two fractions with different denominators such as 2/7 + 1/2 + 2/3? Phil Daro’s video “Against Answer Getting” mentions that is a typical TIMSS question.

    March 12, 2014 at 10:22 am #2764
    Anonymous
    Inactive

    I’m going to go with 5th grade when we start adding fractions with unlike denominators. The standards don’t specify the number of fractions being added. Sounds like a great place to talk about not only adding fractions but also properties of operations. That’s a great video, btw. Everyone should see it. Twice.

    March 12, 2014 at 1:11 pm #2766
    Anonymous
    Inactive

    Based in this, in 5th.

    http://www.illustrativemathematics.org/illustrations/839

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