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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 915 · 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 499 + 903 + 699? (a) 2100 (b) 2000 (c) 2300 (d) 2200
  2. 2.Which is closest to 495 + 99 + 402? (a) 1200 (b) 900 (c) 1000 (d) 1100
  3. 3.Round 67259 to the nearest hundred.
  4. 4.Round 41.08 to one decimal place. =
  5. 5.Round 31.91 to one decimal place. =
  6. 6.Round 98.86 to one decimal place. =
  7. 7.Round 76798 to the nearest hundred.
  8. 8.Round 86.26 to one decimal place. =
  9. 9.Which is closest to 397 × 89? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  10. 10.Round 98.19 to one decimal place. =
  11. 11.Which is closest to 1596 ÷ 41? (a) 40 (b) 400 (c) 80 (d) 20
  12. 12.Round 84.77 to one decimal place. =
  13. 13.Which is closest to 2004 ÷ 49? (a) 40 (b) 20 (c) 400 (d) 80
  14. 14.Which is closest to 801 × 39? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  15. 15.Round 31553 to the nearest ten.
  16. 16.Which is closest to 95 + 395 + 696? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  17. 17.Which is closest to 1202 ÷ 31? (a) 40 (b) 80 (c) 20 (d) 400
  18. 18.Round 93.76 to one decimal place. =
  19. 19.Which is closest to 504 × 78? (Round each number first.) (a) 4000 (b) 80000 (c) 400000 (d) 40000
  20. 20.Which is closest to 796 × 78? (Round each number first.) (a) 64000 (b) 128000 (c) 6400 (d) 640000
  21. 21.Which is closest to 599 ÷ 19? (a) 30 (b) 60 (c) 300 (d) 15
  22. 22.Round 39107 to the nearest ten.
  23. 23.Which is closest to 297 × 20? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  24. 24.Round 19168 to the nearest ten.
  25. 25.Round 71.92 to one decimal place. =
  26. 26.Which is closest to 599 × 82? (Round each number first.) (a) 480000 (b) 4800 (c) 96000 (d) 48000
  27. 27.Round 61.94 to one decimal place. =
  28. 28.Which is closest to 700 + 100 + 598? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  29. 29.Which is closest to 1493 ÷ 29? (a) 100 (b) 50 (c) 25 (d) 500
  30. 30.Which is closest to 2096 ÷ 31? (a) 700 (b) 35 (c) 70 (d) 140
  31. 31.Which is closest to 601 × 70? (Round each number first.) (a) 420000 (b) 84000 (c) 4200 (d) 42000
  32. 32.Which is closest to 798 × 82? (Round each number first.) (a) 64000 (b) 128000 (c) 640000 (d) 6400
  33. 33.Round 26149 to the nearest ten.
  34. 34.Which is closest to 197 × 70? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  35. 35.Which is closest to 598 × 81? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  36. 36.Round 12.14 to one decimal place. =
  37. 37.Which is closest to 1402 ÷ 21? (a) 140 (b) 700 (c) 35 (d) 70
  38. 38.Which is closest to 703 × 71? (Round each number first.) (a) 98000 (b) 490000 (c) 4900 (d) 49000
  39. 39.Round 50.38 to one decimal place. =
  40. 40.Round 49275 to the nearest thousand.

Answer key

  1. 2100
  2. 1000
  3. 67300
  4. 41.1
  5. 31.9
  6. 98.9
  7. 76800
  8. 86.3
  9. 36000
  10. 98.2
  11. 40
  12. 84.8
  13. 40
  14. 32000
  15. 31550
  16. 1200
  17. 40
  18. 93.8
  19. 40000
  20. 64000
  21. 30
  22. 39110
  23. 6000
  24. 19170
  25. 71.9
  26. 48000
  27. 61.9
  28. 1400
  29. 50
  30. 70
  31. 42000
  32. 64000
  33. 26150
  34. 14000
  35. 48000
  36. 12.1
  37. 70
  38. 49000
  39. 50.4
  40. 49000

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