This can be used to introduce equivalent fractions and activate the student's prior knowledge! It is also leads into a great discussion. This aligns with CCSS.4.NF.A.1
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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.