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Name 3-13 Date 1 Use benchmarks of 0, __ , and 1 to estimate the sum or 2 difference. Then find the actual sum or difference. 5 + __ 4 1. ___ 10 13 â __ 3 2. ___ 14 9 1 Estimate: 85 17 ___ or ___ Sum: 90 18 1 __ Estimate: 2 1 __ 2 Difference: 8 â __ 7 3. __ 9 7 13 + __ 3 4. ___ 8 14 0 1 ___ Estimate: 2 Estimate: 72 Difference: 4 Sum: 19 1___ 28 Show your work. Write an equation. Then solve. Equations may vary. 5. A rectangle has an area of 20 square feet and a length of 6 feet. What is its width? 1 6 â w = 20; 3 __ feet 3 6. Bailey attends gymnastics practice for 8 hours each week. 1 the number of hours that the gym is open for This is __ 4 practice. How many hours is the gym open for practice? 1 __ â a = 8; 32 hours 4 Solve. 1 Ã· = 7. __ 3 4 1 ___ 12 1 8. __ â 3= 4 3 __ 4 1 = 9. 14 â __ 6 1 2 __ 3 Â© Houghton Mifflin Harcourt Publishing Company 1 Ã· 5 different 10. Stretch Your Thinking How is solving __ 8 1 from solving __ â 5? 8 1 Ã· 1 5, multiply __ by Possible answer: To solve __ 8 8 1 __ 1. 1 the reciprocal of 5: __ â 1 = ___ To solve __ â 5, first 8 5 40 8 5. rewrite 5 as __ Then, multiply the two fractions: 1 5. 1 __ __ â 5 = __ 8 1 8 72 UNIT 3 LESSON 13 Review Operations with Fractions