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After reading the Fractions Progression and the CCSS for 3rd through 5th grade, I am slightly unsure on the expectations for adding fractions. The Progression states, “In grade 4, students calculate sums of fractions with with different denominators where one denominator is a divisor of another, so that only one fraction has to be changed…” (seemed clear to me) yet the standards don’t specifically mention denominators in 4.NF.3.a. I decided to check the Illustrative Tasks for 4.NF.3.a and saw the commentary, “Notice that students are not asked to find the sum because in grade 4, students are limited to computing sums of fractions with like denominators (i.e. fractions where 1 denominator is a multiple of the other).” Will you please elaborate on the expectation?
I think your question is answered here (http://commoncoretools.me/forums/topic/adding-and-subtracting-mixed-numbers-grade-4/#post-1831).
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