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Which of the following is a good explanation for how to add fractions? A. Add equal-sized parts-finding a common denominator can help to solve the problem. B. Find the common denominator because one only adds the numerators. C. Put together through combining the numerators. D. Join parts and find a common denominator in order to combine correctly.

When adding fractions with like denominators it is important for students to focus on which key idea? A. Know the meaning of numerator and denominator B. Connect fractions to whole numbers C. Units are the same D. Compare the two quantities