1. COURSE 2 LESSON 4-2 Find +. 2727 3737 Keep the denominator the same. 2727 3737 + = 2 + 3 7 Add the numerators. The answer is close to the estimate. 5757 = 2727 3737 + 1414 1212 3434 +, or Estimate Adding and Subtracting Fractions 4-2

2. COURSE 2 LESSON 4-2 Find +. 5959 1616 The LCD is 18. 5959 5 2 9 2 = 10 18 5959 1616 + 1212 1212 + 0, or Estimate 1616 1 3 6 3 3 18 The LCD is 18. + = = + 13 18 Add the numerators. The answer is close to the estimate. Adding and Subtracting Fractions 4-2

3. A recipe calls for cup white flour and cup wheat flour. How many total cups of flour are used? Adding and Subtracting Rational Numbers COURSE 3 LESSON 4-4 1313 3434 You need, or 1, cups of flour. 13 12 1 12 1313 1 4 3 4 + 3434 =+ 3 4 3 Write equivalent fractions with the same denominator. 4 12 =+ 9 12 Simplify. = 13 12 Add the numerators. 4-4