4.4 Adding and Subtracting Unlike Fractions What are your objectives for Section 4.4? How can you accomplish each objective? 1 Add Unlike Fractions • Write the procedure for Adding or Subtracting Unlike Fractions in your own words, and add steps from previous sections as needed. • Be sure that the answer is in lowest terms! • Complete the given examples on your own. • Complete You Trys 1–3. 2 Subtract Unlike Fractions • Use the same procedure you outlined for Objective 1. • Complete the given examples on your own. • Complete You Trys 4 and 5. 3 Add and Subtract Fractions with • Use prime factorization to fi nd the LCD if needed. • Complete the given example on your own. • Complete You Try 6. 4 Add and Subtract Natural Numbers • Follow Example 7, and outline a procedure for this objective. • Complete the given example on your own. • Complete You Try 7. 5 Solve Applied Problems Involving Adding and Subtracting Fractions • Use the Five Steps for Solving Applied Problems that you previously learned. • Complete the given examples on your own. • Complete You Trys 8 and 9. Read the explanations, follow the examples, take notes, and complete the You Trys. 1 Add Unlike Fractions In this section, we will learn how to add and subtract unlike fractions. Let’s think about the addition problem 1 2 1 4 . As the fractions are written now, we cannot add them because their denominators are different. How can we add them? Let’s look at some fi gures as well as some number lines. We can represent 1 2 1 4 like this: 1 2 1 4 1 1 We cannot add halves and fourths because they are not equally-sized pieces of the circles. Large Denominators and Fractions 242 CHAPTER 4 Adding and Subtracting Fractions www.mhhe.com/messersmith
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