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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 691 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 698 × 29? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000
  2. 2.Which is closest to 602 × 72? (Round each number first.) (a) 84000 (b) 420000 (c) 4200 (d) 42000
  3. 3.Which is closest to 396 × 42? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  4. 4.Round 73019 to the nearest hundred.
  5. 5.Round 98.11 to one decimal place. =
  6. 6.Round 38.54 to one decimal place. =
  7. 7.Which is closest to 204 + 801 + 901? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  8. 8.Which is closest to 704 + 595 + 403? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  9. 9.Which is closest to 803 + 101 + 501? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  10. 10.Round 21.27 to one decimal place. =
  11. 11.Round 84.27 to one decimal place. =
  12. 12.Which is closest to 595 + 400 + 895? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  13. 13.Round 10132 to the nearest hundred.
  14. 14.Round 75696 to the nearest thousand.
  15. 15.Which is closest to 595 + 600 + 301? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  16. 16.Which is closest to 298 × 21? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  17. 17.Which is closest to 2792 ÷ 41? (a) 140 (b) 35 (c) 700 (d) 70
  18. 18.Which is closest to 204 × 88? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  19. 19.Which is closest to 898 × 32? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  20. 20.Round 90.47 to one decimal place. =
  21. 21.Which is closest to 901 + 397 + 495? (a) 1900 (b) 1800 (c) 2000 (d) 1700
  22. 22.Which is closest to 497 + 803 + 504? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  23. 23.Round 95237 to the nearest ten.
  24. 24.Which is closest to 596 + 296 + 301? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  25. 25.Which is closest to 801 × 78? (Round each number first.) (a) 640000 (b) 6400 (c) 64000 (d) 128000
  26. 26.Round 61501 to the nearest ten.
  27. 27.Which is closest to 202 × 21? (Round each number first.) (a) 400 (b) 40000 (c) 4000 (d) 8000
  28. 28.Which is closest to 896 × 20? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  29. 29.Which is closest to 299 × 38? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  30. 30.Which is closest to 700 + 597 + 701? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  31. 31.Which is closest to 696 + 303 + 499? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  32. 32.Which is closest to 400 × 31? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  33. 33.Round 19.26 to one decimal place. =
  34. 34.Round 34.59 to one decimal place. =
  35. 35.Round 27.13 to one decimal place. =
  36. 36.Which is closest to 3508 ÷ 49? (a) 140 (b) 700 (c) 35 (d) 70
  37. 37.Which is closest to 300 × 68? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  38. 38.Round 47.83 to one decimal place. =
  39. 39.Round 14672 to the nearest hundred.
  40. 40.Which is closest to 196 + 603 + 402? (a) 1400 (b) 1200 (c) 1300 (d) 1100

Answer key

  1. 21000
  2. 42000
  3. 16000
  4. 73000
  5. 98.1
  6. 38.5
  7. 1900
  8. 1700
  9. 1400
  10. 21.3
  11. 84.3
  12. 1900
  13. 10100
  14. 76000
  15. 1500
  16. 6000
  17. 70
  18. 18000
  19. 27000
  20. 90.5
  21. 1800
  22. 1800
  23. 95240
  24. 1200
  25. 64000
  26. 61500
  27. 4000
  28. 18000
  29. 12000
  30. 2000
  31. 1500
  32. 12000
  33. 19.3
  34. 34.6
  35. 27.1
  36. 70
  37. 21000
  38. 47.8
  39. 14700
  40. 1200

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