Common denominators: 3/5 and 7/2 (Full video)

Khan Academy

Supporting grades: 4

Description: Lindsay uses fraction models and multiplication to find common denominators for 3/5 and 7/2. So we have two fractions, three fifths and seven halves and we wanna take their denominators of five and two and change them to be a common denominator of 10. So, these should represent five equal pieces, or fifths. To show three fifths, we need to shade three of those five pieces.

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