3.NF.A.3. Explain equivalence of fractions in special cases, and compare fractions by reasoning about their size.
3.NF.A.3.a. Understand two fractions as equivalent (equal) if they are the same size, or the same point on a number line.
3.NF.A.3.b. Recognize and generate simple equivalent fractions, e.g., $1/2 = 2/4$, $4/6 = 2/3$. Explain why the fractions are equivalent, e.g., by using a visual fraction model.
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