Description
In Topic D, students apply their understanding of whole number addition (the combining of like units) and subtraction (finding an unknown part) to work with fractions (4.NF.3a). They see through visual models that, if the units are the same, computation can be performed immediately, e.g., 2 bananas + 3 bananas = 5 bananas and 2 eighths + 3 eighths = 5 eighths. They see that, when subtracting fractions from one whole, the whole is decomposed into the same units as the part being subtracted, e.g., 1 – 3/5 = 5/5 – 3/5 = 2/5 . Students practice adding more than two fractions and model fractions in word problems using tape diagrams (4.NF.3d).
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Credits
From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 5, Topic D Overview.
Available from engageny.org/resource/grade-4-mathematics-module-5-topic-d-overview; accessed 2015-05-29.
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