Interactive Voting - Estimation and Rounding
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The document discusses strategies for estimating sums and rounding numbers up to the highest place value when adding. It introduces front end estimation, which involves drawing a line through numbers being added and changing digits after the line to zeros, using only the front digits. Examples demonstrate rounding numbers to the hundreds, thousands, or ten thousands place before adding. Front end estimation is said to be an easier strategy than full rounding when numbers have the same number of digits.
Interactive Voting - Estimation and Rounding
- 1. Estimation & Rounding Up
- 2. Front End & Rounding Estimation Strategies Next Page
- 3. Type your name and send: Next Page
- 4. Estimation The next few slides will help you test your estimation skills. Next Page
- 5. Can I buy three for $100? 45 Next Page
- 6. Can I buy three for $100? $23 Next Page
- 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. Can I buy three for $20? $ 4.95 CHECKERS Next Page
- 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. + 26 + 1,427 + 216 What is the highest place value of each number? Next Page 375 Hundreds 26 Tens 1,427 Thousands 216 Hundreds
- 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. After you round, add the numbers! 400 30 1000 + 200 1630 Next Page
- 13. 8857 4758 7045 + 2110 8857 4758 7045 + 2110 Round each number to the highest place value? 9000 5000 7000 + 2000 Next Page
- 14. Between 11,000 and 15,000 Between 16,000 and 20,000 Between 20,000 and 25,000 Between 28,000 and 33,000 Estimate to choose the most reasonable answer. 9000 5000 7000 +2000 Next Page
- 15. 247 6542 489 + 92 247 6542 489 + 92 Round each number to the highest place value? 200 7000 500 + 90 Next Page
- 16. 200 7000 500 + 90 A little less than 7,000 A little less than 8,000 A little more than 8,000 A little more than 10,000 Next Page
- 17. 5028 6732 1285 + 835 Round each number to the highest place value? 5000 7000 1000 + 800 5028 6732 1285 + 835 Next Page
- 18. Front End Estimation Estimation Strategy Next Page
- 19. FRONT END The name of this strategy gives you a clue about how it is used. The word FRONT should remind you that you are only concerned with the front portion of the number. Many people think this strategy is easier than rounding to the highest place value. Next Page
- 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. + 26 + 1,427 + 216 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. 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. 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. Between 11,000 and 15,000 Between 16,000 and 20,000 Between 20,000 and 25,000 Between 28,000 and 33,000 Estimate to choose the most reasonable answer. 8000 4000 7000 +2000 Next Page
- 25. 247 6542 489 + 92 247 6542 489 + 92 240 6540 480 + 90 Use the front end estimation strategy. Next Page
- 26. Estimate to find the best answer. 240 6540 480 + 90 A little more than 7,000 A little more than 8,000 A little less than 9,000 A little less than 10,000 7350 Next Page
- 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. Estimate and choose the most reasonable answer. Between 11,000 and 15,000 Between 16,000 and 20,000 Between 20,000 and 25,000 Between 28,000 and 33,000 5000 6700 1200 + 800 13700 Next Page
- 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. 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