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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 126 · 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 1395 ÷ 21? (a) 140 (b) 70 (c) 35 (d) 700
  2. 2.Round 36.11 to one decimal place. =
  3. 3.Round 29418 to the nearest thousand.
  4. 4.Which is closest to 2005 ÷ 41? (a) 25 (b) 50 (c) 500 (d) 100
  5. 5.Round 42.11 to one decimal place. =
  6. 6.Which is closest to 3600 ÷ 41? (a) 900 (b) 180 (c) 90 (d) 45
  7. 7.Which is closest to 702 + 504 + 400? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  8. 8.Which is closest to 298 × 78? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  9. 9.Which is closest to 897 × 78? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  10. 10.Which is closest to 302 × 80? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  11. 11.Which is closest to 803 + 403 + 901? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  12. 12.Which is closest to 499 + 397 + 704? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  13. 13.Round 12.69 to one decimal place. =
  14. 14.Which is closest to 701 × 78? (Round each number first.) (a) 56000 (b) 112000 (c) 5600 (d) 560000
  15. 15.Which is closest to 2391 ÷ 39? (a) 600 (b) 120 (c) 60 (d) 30
  16. 16.Round 45846 to the nearest hundred.
  17. 17.Which is closest to 3493 ÷ 51? (a) 140 (b) 700 (c) 35 (d) 70
  18. 18.Round 59.48 to one decimal place. =
  19. 19.Round 37.64 to one decimal place. =
  20. 20.Round 58.78 to one decimal place. =
  21. 21.Which is closest to 598 × 28? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  22. 22.Round 10.59 to one decimal place. =
  23. 23.Round 49.91 to one decimal place. =
  24. 24.Which is closest to 604 × 60? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  25. 25.Which is closest to 196 + 497 + 103? (a) 900 (b) 800 (c) 1000 (d) 700
  26. 26.Which is closest to 600 × 81? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  27. 27.Round 61316 to the nearest hundred.
  28. 28.Round 96861 to the nearest thousand.
  29. 29.Which is closest to 398 + 301 + 205? (a) 1100 (b) 1000 (c) 800 (d) 900
  30. 30.Round 48.86 to one decimal place. =
  31. 31.Round 68.74 to one decimal place. =
  32. 32.Which is closest to 402 × 39? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  33. 33.Which is closest to 1597 ÷ 19? (a) 160 (b) 800 (c) 80 (d) 40
  34. 34.Round 24565 to the nearest hundred.
  35. 35.Which is closest to 403 × 28? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  36. 36.Which is closest to 895 ÷ 29? (a) 30 (b) 15 (c) 60 (d) 300
  37. 37.Which is closest to 298 × 71? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  38. 38.Round 95.82 to one decimal place. =
  39. 39.Round 18.38 to one decimal place. =
  40. 40.Round 18789 to the nearest thousand.

Answer key

  1. 70
  2. 36.1
  3. 29000
  4. 50
  5. 42.1
  6. 90
  7. 1600
  8. 24000
  9. 72000
  10. 24000
  11. 2100
  12. 1600
  13. 12.7
  14. 56000
  15. 60
  16. 45800
  17. 70
  18. 59.5
  19. 37.6
  20. 58.8
  21. 18000
  22. 10.6
  23. 49.9
  24. 36000
  25. 800
  26. 48000
  27. 61300
  28. 97000
  29. 900
  30. 48.9
  31. 68.7
  32. 16000
  33. 80
  34. 24600
  35. 12000
  36. 30
  37. 21000
  38. 95.8
  39. 18.4
  40. 19000

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