Fourth- and fifth-grade learners can use differentiated number sets within CGI problem structures to add and subtract fractions with unlike denominators.

Contributor Notes

Katherine A. G. Phelps,, teaches fifth grade and grades 4–5 combinations at Efland Cheeks Elementary School in Efland, North Carolina. She is interested in using high-cognitive-demand problems and student discussions in the math classroom.

(Corresponding author is Phelps
Teaching Children Mathematics


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