Interactive Voting - Estimation and Rounding

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An interactive voting lesson using Qwizdom Student Response Systems

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Interactive Voting - Estimation and Rounding

  1. 1. Estimation & Rounding Up
  2. 2. Front End & Rounding Estimation Strategies Next Page
  3. 3. Type your name and send: Next Page
  4. 4. Estimation <ul><li>The next few slides </li></ul><ul><li>will help you </li></ul><ul><li>test your </li></ul><ul><li>estimation skills. </li></ul>Next Page
  5. 5. Can I buy three for $100? 45 Next Page
  6. 6. Can I buy three for $100? $23 Next Page
  7. 7. Can I buy 5 for £50? £11.87 The basketball would have to cost ______ or less for me to purchase five of them for £50. Answer in pounds. Next Page
  8. 8. Can I buy three for $20? $ 4.95 CHECKERS Next Page
  9. 9. Rounding to the highest Place Value Round each number to its highest possible place value. Some numbers will be rounded to ten- thousands , thousands , hundreds , or tens . Next Page
  10. 10. <ul><li>+ 26 + 1,427 + 216 </li></ul>What is the highest place value of each number? Next Page 375 Hundreds 26 Tens 1,427 Thousands 216 Hundreds
  11. 11. Round to the highest place. Next Page Write on board 375 Hundreds 400 26 Tens 30 1,427 Thousands 1,000 216 Hundreds 200
  12. 12. After you round, add the numbers! 400   30 1000 + 200 1630 Next Page
  13. 13. 8857   4758 7045 + 2110 8857   4758 7045 + 2110 Round each number to the highest place value? 9000 5000 7000 + 2000 Next Page
  14. 14. <ul><li>Between 11,000 and 15,000 </li></ul><ul><li>Between 16,000 and 20,000 </li></ul><ul><li>Between 20,000 and 25,000 </li></ul><ul><li>Between 28,000 and 33,000 </li></ul>Estimate to choose the most reasonable answer. 9000   5000 7000 +2000 Next Page
  15. 15. 247 6542 489 + 92 247 6542 489 + 92 Round each number to the highest place value? 200 7000 500 + 90 Next Page
  16. 16. <ul><li>200 </li></ul><ul><li>7000 </li></ul><ul><li>500 </li></ul><ul><li>+ 90 </li></ul><ul><li>A little less than 7,000 </li></ul><ul><li>A little less than 8,000 </li></ul><ul><li>A little more than 8,000 </li></ul><ul><li>A little more than 10,000 </li></ul>Next Page
  17. 17. 5028 6732 1285 + 835 Round each number to the highest place value? 5000 7000 1000 + 800 5028 6732 1285 + 835 Next Page
  18. 18. Front End Estimation Estimation Strategy Next Page
  19. 19. FRONT END <ul><li>The name of this strategy gives you a clue about how it is used. </li></ul><ul><li>The word FRONT should remind you that you are only concerned with the front portion of the number. </li></ul><ul><li>Many people think this strategy is easier than rounding to the highest place value. </li></ul>Next Page
  20. 20. 4,32 0 74 0 2,39 0 + 2 0 4,329 748 2,398 + 28 Draw a line through your list of numbers so that you have at least one digit from each addend in front of (before) the line. Change all numbers after the line to zeros. All numbers before the line stay the same. Next Page
  21. 21. <ul><li>+ 26 + 1,427 + 216 </li></ul>Where will we place the line if using front end estimation? Next Page 375 37 0 26 2 0 1,427 1,42 0 216 21 0
  22. 22. 8857   4758 7045 + 2110 8857   4758 7045 + 2110 Use the front end estimation strategy. 8 000 4 000 7 000 + 2 000 Next Page
  23. 23. 8857   4758 7045 + 2110 8857   4758 7045 + 2110 8 000 4 000 7 000 + 2 000 Very EASY when the addends have the same number of digits Draw the line after the first number In each addend. Next Page
  24. 24. <ul><li>Between 11,000 and 15,000 </li></ul><ul><li>Between 16,000 and 20,000 </li></ul><ul><li>Between 20,000 and 25,000 </li></ul><ul><li>Between 28,000 and 33,000 </li></ul>Estimate to choose the most reasonable answer. 8000   4000 7000 +2000 Next Page
  25. 25. 247 6542 489 + 92 247 6542 489 + 92 240 6540 480 + 90 Use the front end estimation strategy. Next Page
  26. 26. Estimate to find the best answer. <ul><li>240 </li></ul><ul><li>6540 </li></ul><ul><li>480 </li></ul><ul><li>+ 90 </li></ul><ul><li>A little more than 7,000 </li></ul><ul><li>A little more than 8,000 </li></ul><ul><li>A little less than 9,000 </li></ul><ul><li>A little less than 10,000 </li></ul>7350 Next Page
  27. 27. 5028 6732 1285 + 835 Use the front end estimation strategy. 50 00 67 00 12 00 + 8 00 5028 6732 1285 + 835 Next Page
  28. 28. Estimate and choose the most reasonable answer. <ul><li>Between 11,000 and 15,000 </li></ul><ul><li>Between 16,000 and 20,000 </li></ul><ul><li>Between 20,000 and 25,000 </li></ul><ul><li>Between 28,000 and 33,000 </li></ul> 5000 6700 1200 + 800 13700 Next Page
  29. 29. 3,876 5,814 3,176 + 7,895 4, 000 6, 000 3, 000 + 8, 000 3, 000 5, 000 3, 000 + 7, 000 Which one rounds to the highest place value? A B Next Page
  30. 30. 9,876 8,514 6,092 + 3,895 9, 000 8, 000 6, 000 + 3, 000 10, 000 9, 000 6, 000 + 4, 000 Which one rounds to the highest place value? A B End of show

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