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LESSON 1 Fraction Sums and Differences

  1. First, use the number line above to estimate the sums and differences below. Then find the sums and differences. Use any method you choose.
    1. −
    2. +
    3. + +
    4. +
  2. Explain how the number line can help estimate the sum in Question 1C.
  3. Show how to use fraction circle pieces to solve the problem in Question 1D.
After solving a few problems, Luis thinks of a rule for adding fractions with unlike denominators, or fractions with denominators that are not the same.