Under the Common Core State Standards in mathematics, fractions instruction extends across grades 3 through 6, with operations being taught after students have a firm understanding of where fractions ...

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Many children never master fractions. When asked whether 12/13 + 7/8 was closest to 1, 2, 19, or 21, only 24% of a nationally representative sample of more than 20,000 US 8th graders answered ...