Common Core Focus Standard CC 4.NF.1
Explain why a fraction a/b is equivalent to a fraction (n × a)/(n × b) by using visual fraction models, with attention to how the number and size of the parts differ even though the two fractions themselves are the same size. Use this principle to recognize and generate equivalent fractions.
Aligning Assessment & Planning Instruction
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Opportunities for InDepth Focus
Extending fraction equivalence to the general case is necessary to extend arithmetic from whole numbers to fractions and decimals.