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1.2 Estimating With Whole #S And Decimals

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1.2 Estimating With Whole #S And Decimals

  1. 1. Estimating with Whole #’s and Decimals <ul><li>Part I: Estimating a product </li></ul><ul><li>Steps: </li></ul><ul><li>Round each number to the greatest possible place </li></ul><ul><li>2) Multiply the rounded numbers </li></ul>
  2. 2. Ex 1) Ex 2)
  3. 3. <ul><li>Part II: Estimating a quotient </li></ul><ul><li>*Use compatible numbers </li></ul><ul><li>Steps: </li></ul><ul><li>Write the numbers so you can divide easily </li></ul><ul><li>2) Divide the numbers </li></ul>
  4. 4. Ex 3) Ex 4)
  5. 5. <ul><li>Part III: Estimating with Decimals </li></ul><ul><li>Steps: </li></ul><ul><li>Do the exact same for multiplying as you do for whole #’s (rounding) </li></ul><ul><li>Do the exact same for dividing as you do for whole #’s (compatible #’s) </li></ul>
  6. 6. Ex 5) Ex 6)
  7. 7. Put it all together Ex 7) You buy 18 stamps at 43 ¢ each. Estimate how much you are spending. Operation: What to do:
  8. 8. Ex 8) To buy a new car, you have to save $. You already have $3,432 in the bank. For 1 year, you decide to put in $256 a month. After that year, estimate how much you can spend on a car. (How much $ will you have?)
  9. 9. Ex 9) You have 53,871 hairs on your head. Let’s say you want to make very sparse wigs for 84 people. Approximate how many strands each wig with get. Operation: What you do:
  10. 10. Homework: Page 19-20 #1-6,8, 10 ,11,14

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