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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 413 · 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.Round 24235 to the nearest hundred.
  2. 2.Round 33.53 to one decimal place. =
  3. 3.Round 77.29 to one decimal place. =
  4. 4.Which is closest to 903 × 78? (Round each number first.) (a) 144000 (b) 7200 (c) 720000 (d) 72000
  5. 5.Which is closest to 1006 ÷ 19? (a) 500 (b) 50 (c) 100 (d) 25
  6. 6.Which is closest to 298 × 49? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  7. 7.Which is closest to 204 × 32? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  8. 8.Round 84.64 to one decimal place. =
  9. 9.Round 13.21 to one decimal place. =
  10. 10.Which is closest to 602 × 31? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  11. 11.Round 55558 to the nearest ten.
  12. 12.Round 93574 to the nearest thousand.
  13. 13.Round 19238 to the nearest hundred.
  14. 14.Which is closest to 1592 ÷ 19? (a) 80 (b) 800 (c) 160 (d) 40
  15. 15.Round 41806 to the nearest hundred.
  16. 16.Round 88.56 to one decimal place. =
  17. 17.Round 23.61 to one decimal place. =
  18. 18.Which is closest to 796 × 62? (Round each number first.) (a) 48000 (b) 480000 (c) 96000 (d) 4800
  19. 19.Which is closest to 1991 ÷ 51? (a) 80 (b) 40 (c) 400 (d) 20
  20. 20.Which is closest to 400 × 79? (Round each number first.) (a) 3200 (b) 320000 (c) 32000 (d) 64000
  21. 21.Which is closest to 3208 ÷ 41? (a) 160 (b) 80 (c) 40 (d) 800
  22. 22.Which is closest to 3007 ÷ 49? (a) 60 (b) 120 (c) 30 (d) 600
  23. 23.Which is closest to 994 ÷ 21? (a) 25 (b) 100 (c) 50 (d) 500
  24. 24.Which is closest to 399 × 88? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  25. 25.Round 97531 to the nearest ten.
  26. 26.Round 50911 to the nearest thousand.
  27. 27.Round 23.14 to one decimal place. =
  28. 28.Which is closest to 597 × 58? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  29. 29.Which is closest to 401 × 22? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  30. 30.Which is closest to 803 × 39? (Round each number first.) (a) 64000 (b) 320000 (c) 32000 (d) 3200
  31. 31.Round 54.81 to one decimal place. =
  32. 32.Round 95395 to the nearest hundred.
  33. 33.Round 55011 to the nearest hundred.
  34. 34.Which is closest to 400 + 301 + 695? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  35. 35.Round 29.78 to one decimal place. =
  36. 36.Which is closest to 301 × 91? (Round each number first.) (a) 2700 (b) 270000 (c) 54000 (d) 27000
  37. 37.Which is closest to 900 × 19? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  38. 38.Round 69.94 to one decimal place. =
  39. 39.Round 64474 to the nearest thousand.
  40. 40.Round 95757 to the nearest hundred.

Answer key

  1. 24200
  2. 33.5
  3. 77.3
  4. 72000
  5. 50
  6. 15000
  7. 6000
  8. 84.6
  9. 13.2
  10. 18000
  11. 55560
  12. 94000
  13. 19200
  14. 80
  15. 41800
  16. 88.6
  17. 23.6
  18. 48000
  19. 40
  20. 32000
  21. 80
  22. 60
  23. 50
  24. 36000
  25. 97530
  26. 51000
  27. 23.1
  28. 36000
  29. 8000
  30. 32000
  31. 54.8
  32. 95400
  33. 55000
  34. 1400
  35. 29.8
  36. 27000
  37. 18000
  38. 69.9
  39. 64000
  40. 95800

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