7BOBO,<dHHHHHH,;H,;0,< ,< -Z`@xHH(FG(HH(d'@, l"`/F=$(,;P,;L4((  <(PH,;,F,7  ,;!(}DSETj  ",;|,;,;y,; *Ry,;y,; y,;  y,:  _y,:ny,:y,:y,:%3y,:)>y,;/01789:def./012KLMNOVoBCDEFDE^x ; < = > ? J K p 7 8 9      ^ _ `     F G H mn./"#$%&4Xstu5Tp   abcde1234OPef9:;<fgh01234T 15      L V   ; D       ^  _   m     u     1   P,;xn,;t,;p e,;l Wi,;h,;d,;`#l,;\ Unit 2: Estimating Answers Study Activities 1. Pat plans to fill the flower bed at the entrance to an office building with daisies ( as shown in figure 2-1). Pat has seen flats of daisies in the correct size ( each size flat holds 24 plants) and remembers that one plant costs about 39 cents. At the garden center there is always a discount for buying a whole flat. Pat doesnt know exactly how much , but he guesses that it will be near 10% off. What is a rough estimate for the cost of 100 plants? Place Figure 2-1 here What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct):  2. The manp tells you that it is 423 miles from Central City to Greenville. You know that, with mixed town and freeway driving, you can average about 50 miles per hour. You are in Central City and need to be in Greenville by noon. Make a rough estimate of what time you should leave. What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct):  3.Round the following numbers to the nearest thousand. 1. 7,644 5. 50,645 2. 406,342 6. 1,498 3. 2,705 4. 14,782 What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct):  4. Round these numbers to the nearest hundred. 1. 7,644 5. 50,645 2. 406,342 6. 1,498 3. 2,705 7. 4,701 4. 14,782 What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate ande the units are correct):  5. Lets practice rounding numbers that have nines in them. 1. Round 7,999 to the nearest ten. 2. Round 7,999 to the nearest hundred. 3. Round 7,999 to the nearest thousand. 4. Round 9,999 to the nearest thousand. What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct):  6. First use your calculator to ass these weights. Then round your answer to the nearest pound. 4.302 lb + 34.485 lb + 83.41 lb + 102.27 lb + 20.49 lb =? What are you looking for? What do you need to answer the questions? Estimate what yiour answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct): 7. Practice rounding decimals by doing the following problems. First use your calculator and then round the answer. 1. Multiply 45.7 by 99.0357 and round the answer to the nearest tenth. 2. Divide 60.800409 by 21.039 and round the answer to the nearest thousandth. What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct):  8. Estimate: 85.93 + 7.68 Estimate : Subtract 56.7 from 123.9 Estimate: Divide 129.45 by 29.067 Estimate: 45.7 X 99.0357 What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct):  9. Follow the procedure outlined in Figure 2-8 ( in book) to do the following: 1. Divide 70.40508 by 56.073. 2. Multiply 1.23 by 9,786. 3. Carry out this operation (45.6 X 3.08) + 789.034 Place figure 2-8 here What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct):  10. Write down a rough estimate (with units) for each problem. Then work the problem and use your estimate to make sure your answer is a reasonable one. If it isnt, check your estimate and redo the problem. Write both your original estimate and your final answer on your paper. 1. Tina has a 15 inch high stack of covers for a booklet. She wants to know approximately how may covers are in the stack. She finds out from the printer that each cover is about 0.052 inch thick. Finld out how many covers --rounded to the nearest one -- she has. 2. Each sack of potting soil weighs 35.8 pounds. How much will 785 sacks weigh, rounded to the nearest hundred pounds. 3. A lab assistant uses a microscope to measure the width of a row of 9 cells to be 0.1067 millimeter. What is the width of just one of these cells, rounded to the nearest thousandth of a millimeter? (HINT: When you divide a decimal number by 10, you move the decimal point one place to the left.) What are you looking for? What do you need to answer the questions? Estimate what your answer(s) might be ( think of both numbers and terms to be used)? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure you are close to your estimate and the units are correct): DSET|(H,;XN7 )6*N7DSET(H,;T776* 7DSETR ,;,;,;(,;@   ,;$UNIT 2 Study Activities