Unit 10 Contents

1. Compare your answer from Question 1D to Luis's. Do you agree with Luis's answer? Explain why or why not.
2. Did you do the problem the same way as Luis? If not, explain what you did differently.
3. Do you think Luis's method always works for adding fractions? Explain your thinking.
4. Do you think Luis's method is always the best method for adding or subtracting two fractions? Tell why or why not.

Check-In: Questions 5–7

5. Grace calculated + = . Is Grace's answer reasonable? Explain your reasoning without finding an exact answer.
6. Sketch the number line below. Without calculating exactly, estimate about where each of the following sums and differences would be on the number line. You can refer to the pages in the Reference section.
1. +
2. −
3. + +
4. −

7. Find exact answers for the fraction problems in Question 6. Use any method you choose. Show or tell how you solved each problem. Compare your answers to your estimates to check if they are reasonable.

1. Find the fraction sums and differences below. Use any method you choose.
1. +
2. +
3. −
4. −
5. − +
6. − −
2. Make a drawing that shows how to use circle pieces of one color to check if your answers for Questions 1E and 1F are correct. Refer to the Fraction Circle Pieces page in the Reference section.