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v.1.1 1.3.a1 Name Guided Practice Review Practice Estimate. 1. Estimate the sum by rounding to the nearest ten. Estimate. 1. Estimate the sum by applying the Translation strategy. 62 98 + 47 389 + 417 + 392 + 406 + 421 41 82 + 65 2. Estimate the difference by rounding to the nearest hundred. 2. Estimate the sum by applying the Compensation strategy. 6,753 -1,739 498 + 387 + 765 9,347 -3,791 3. Estimate the product by applying Comparison strategy. 3. Estimate the difference by applying FrontEnd strategy. 21 x 5 47,864 – 32,451 Independent Practice Solve word problems using estimation. 1. John bought a new car. In the first 6 months, he drove 5,726 miles. At this rate, estimate how many miles he will drive in 1 year. 2. You invite 48 people to a party. You decide for each person you need two plates, two cups and three napkins. Estimate how many plates, cups and napkins you need to purchase from the store. 1 v.1.1 3. Kelly needs 36 inches of material to make a pair of pants. Estimate how much material she should buy to make 5 pairs of pants. 4. If you had $280, would you approximately have enough money to buy a sofa for $219 and a chair for $44? Show your estimation. 5. Dan uses 4 gallons of paint to cover 1364 square feet of siding. Approximately, how much siding can Dan paint with 8 gallons of paint? 6. Rick, Tim, and Steve did yard work for the neighbor during the summer. Rick earned 139 dollars, Tim earned 227 dollars and Steve earned 158 dollars. Approximate: How much more Tim earned than Steve. How much lesser Rick earned than Tim. How much the boys earned together. 7. Your salary at Hy-Vee is $450 a month. Your car insurance of $127, car payment of $246, and cell phone bill of $86 are all due this month. Estimate if you will have enough money to pay your bills. 8. Tom bought 4 CDs. The first CD cost $9.99, the second and third each cost $11.59 and the fourth one cost $13.89. Estimate how much money he spent on CDs. 2 v.1.1 Critical Thinking 9. Which is not a definition of Estimation? A. To calculate approximately (the amount, extent, magnitude, position, or value of something). B. To use a calculator to the exact answer. C. The act of evaluating or appraising. D. A tentative evaluation or rough calculation, as of worth, quantity, or size. 10. Which estimation strategy would give the best approximation for the equation, 792 + 803 + 789 + 786 + 811? A. Front-end. B. Interval estimation. C. Translation. D. Compensation. Match vocabulary with its correct definition. Vocabulary Definition 11. Front-End A. adjust, getting nearer, closer to, better, approaching, update, amend, improve, revise, modify your estimate, make it bigger, make it smaller 12. Averaging(cluster) B. estimation of similarities and differences. 13. Rounding C. grouped about … , all close to, clustered around 14. Interval D. nearest to 15. Compensation E. not quite, almost, a little less than, nearly, just about, take just the first number, cut-off (truncation) 16. Comparison F. The act of evaluating or appraising, A tentative evaluation or rough calculation, as of worth, quantity, or size. 17. Translation G. A value that is nearly but not exactly correct 18. Nice Numbers H. To change the structure of the problem 19. Approximation I. between … and … , in the region of 3 v.1.1 Answer Key mat_10_1_3_a1_1 Guided Practice 1. Exact: 207. Estimate: 210 Exact: 188. Estimate: 190 2. Exact: 5,014. Estimate: 5,100 Exact: 5,556. Estimate: 5,500 3. The number 21 could be compared to 20. Since 20 x 5 = 100, we estimate that 21 x 5 ≈ 140. Exact: 105. Review Practice 1. Exact: 2,025. Estimate: 2,000 2. 500 + 400 + 700 = 1,600 Exact: 1,650 3. Exact: 15,413. Estimate: 15,000 Independent Practice 1. Exact: 11,452. Estimate: 11,400 2. 100 plates, 100 cups, 150 napkins 3. 200 inches of material. 4. $220 + $40 = $260. Yes 5. 2,700 square feet 6. $70 $90 $530 7. $130 + $250 + $90 = $470. No. 8. $48 9. B 10. C 11. E 12. C 13. D 14. I 15. A 16. B 17. H 18. F 19. G 4