CCSS.Math.Content.4.NF.A.1
Explain why a fraction <i>a</i>/<i>b</i> is equivalent to a fraction (<i>n</i> × <i>a</i>)/(<i>n</i> × <i>b</i>) by using visual fraction models, with attention to how the number and size of the parts differ even though the two fractions thems
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