Review Exercises 213 Order of Operations and Applications of Fractions and Mixed Numbers Section 3.1 For Exercises 1–4, add or subtract the like units. 1. 5 books 3 books 2. 12 cm 6 cm 3. 25 mi – 13 mi 4. 13 CDs – 2 CDs 5. Explain what is meant by the term like fractions. 6. Give an example of two like fractions and two unlike fractions.Answers may vary. 5 1 12 4 4 1 3 750 1 750 1 2 9 2 9 38 9 138 9 1500 7 2 7 7 2 25 12 3 100 9 100 9 15 214 2 7 4 2 9 2 750 3 1 2 312 3 9 4 16 3 15 1 3 For Exercises 7–12, add or subtract the like fractions. Simplify the answer to lowest terms. 7. 8. 9. 10. 11. 12. 21 5 6 5 15 7 6 7 2 9 7 9 5 12 1 12 4 15 6 15 5 6 4 6 Section 3.5 Key Concepts Order of Operations 1. Perform all operations inside parentheses first. 2. Simplify expressions containing exponents or square roots. 3. Perform multiplication or division in the order that they appear from left to right. 4. Perform addition or subtraction in the order that they appear from left to right. Example 2 is an example of an application involving mixed numbers and fractions. Examples Example 1 Example 2 Wallace has a budget of $750 for putting a curb around an area in his front yard. Curbing costs $ per foot.To stay within his budget, how many feet of curbing can he afford? Solution: Wallace can purchase up to 214 ft of curbing. 27 Chapter 3 Review Exercises
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