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Illustrating Addition and Subtraction of Proper Fractions Using Circles

Questions for Learner : 1. How do we add two fractions of the same/common denominator ? 2. Explain the idea of equivalent fractions 3. How do we add two fractions with different denominators ? 4. How do we find the "right" number of parts to split, so that the parts in both fractions are of the same size ? (From this we get the same/common denominator for both fractions)