+Þ>Š>šHHÛ@ÿçÿîÿR#(ü,, ç `,- ^ì&'dAx<x<€L@` ÿ ÿApplied Math Unit 2 - Study Guide` ÿ 01. Do you always need exact answers to problems?  ?2. You can usually recognize a mistake made in calculations by.  G3. Write down situations in which a close answer would be all you need.  1.  2.  3.  ;4. Write down situations which would require exact answers.  1.  2.  3.  K5. Do study activity on page 4. What is the rough estimate for the cost of  100 plants? (show your work)   :6. Is the information given in the above activity exact?  ;7. How does your estimate compare with others in the class?  18. Describe the two ways to make rough estimates.   1.   2.  N9. Estimate the answer to: 117.768 + 43.07 + 897.5 by rounding to the nearest  50.   L10. Now round the above amounts in a less-rough manner (round to the nearest  10):   /11. Tell how to estimate by truncating numbers:   I12. Make a rough estimate of 673 + 429 + 84.7 + 9.52 + 562 by truncating.   %13. Define the meaning of "truncate".   914. Now estimate 117.768 + 43.07 + 897.5 by truncating.  115. Is truncating more accurate or less accurate?   L16. Do Study Activity on page 6. ..."Make a rough estimate of what time you  should leave Central City."  S17. By looking for easy combinations that add to ten, find a rough estimate for the $ sum: 9.1 + 6.2 + 3.0 + 4.4 or 7.2.  .18. List the four steps used to round numbers.  1.  2.  3.  4.  T19. An alternative to the four steps listed above is to draw a ____________________.   020. Round the following to the nearest thousand.  1. 7,644 5. 50,645  2. 406,342 6. 1,498  3. 14,782 7. 4,701  /21. Round these numbers to the nearest hundred.  1. 7,644 5. 50,645  2. 406,342 6. 1,498  3. 14,782 7. 4,701  +22. Round these numbers to the nearest ten.  1. 7,644 5. 50,645  2. 406,342 6. 1,498  3. 14,782 7. 4,701  I23. Do Study Activity at the top of page 14. Round to the nearest pound.   O24. Does it make any difference whether you first add and then round, or first  round and then add?  K25. To get a more accurate answer, what should you do first - round or add?   E26. To work a problem in your head, should you round first or second?   I27. Why should you do some rounding and rough estimating before you begin  to work a problem?     28. Study Activity on page 15:  Estimate: 85.94 + 7.68 # Estimate: Subtract 56.7 from 123.9 " Estimate: Divide 129.45 by 29.067  Estimate 45.7 x 99.0357  U29. If there are more than three numbers in a problem, you may want to round half of L them _______ and half of them _______ to balance out the _________________.  30. Study Activity page 17:  1. Divide 70.40508 by 56.073.  2. Multiply 1.23 by 9,786 4 3. Carry out this operation (45.6 x 3.08) + 789.034  E31. Before you work a problem, what question should you ask yourself?   D32. After you work a problem, what question should you ask yourself?   ,33. Do Study Activity 1-3 at top of page 19.  1.   2.   3.   434. Does everyone make rough estimates the same way?    $7.768 + 43.07 + 897.5 by truncating.