In lesson 6.5 on common denominators and equivalent fractions, students learn that a common denominator is a shared multiple of the denominators of two or more fractions. To find equivalent fractions, multiply or divide both the numerator and denominator by the same non-zero number. For example, to create an equivalent fraction for 1/2, multiplying both by 2 gives you 2/4. Understanding these concepts helps in adding or comparing fractions with different denominators.
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