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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 56 · 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 795 ÷ 39? (a) 40 (b) 10 (c) 20 (d) 200
  2. 2.Round 49284 to the nearest ten.
  3. 3.Which is closest to 1391 ÷ 21? (a) 700 (b) 140 (c) 70 (d) 35
  4. 4.Which is closest to 698 + 299 + 303? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  5. 5.Which is closest to 601 + 397 + 100? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  6. 6.Round 11.74 to one decimal place. =
  7. 7.Round 1724 to the nearest ten.
  8. 8.Which is closest to 297 × 71? (Round each number first.) (a) 21000 (b) 2100 (c) 210000 (d) 42000
  9. 9.Which is closest to 499 × 49? (Round each number first.) (a) 250000 (b) 25000 (c) 2500 (d) 50000
  10. 10.Round 38.78 to one decimal place. =
  11. 11.Round 91.63 to one decimal place. =
  12. 12.Round 48203 to the nearest ten.
  13. 13.Round 23.72 to one decimal place. =
  14. 14.Which is closest to 797 + 198 + 804? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  15. 15.Which is closest to 603 ÷ 31? (a) 10 (b) 40 (c) 20 (d) 200
  16. 16.Round 51.64 to one decimal place. =
  17. 17.Round 61.59 to one decimal place. =
  18. 18.Round 16.89 to one decimal place. =
  19. 19.Round 45.74 to one decimal place. =
  20. 20.Round 93926 to the nearest ten.
  21. 21.Which is closest to 200 × 18? (Round each number first.) (a) 400 (b) 40000 (c) 4000 (d) 8000
  22. 22.Which is closest to 296 × 31? (Round each number first.) (a) 900 (b) 18000 (c) 9000 (d) 90000
  23. 23.Round 65406 to the nearest thousand.
  24. 24.Round 42619 to the nearest ten.
  25. 25.Which is closest to 397 × 28? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  26. 26.Which is closest to 802 + 297 + 400? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  27. 27.Which is closest to 501 + 502 + 605? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  28. 28.Round 60.48 to one decimal place. =
  29. 29.Which is closest to 201 + 198 + 495? (a) 1100 (b) 800 (c) 900 (d) 1000
  30. 30.Which is closest to 498 × 49? (Round each number first.) (a) 250000 (b) 25000 (c) 50000 (d) 2500
  31. 31.Round 14.29 to one decimal place. =
  32. 32.Which is closest to 495 + 300 + 201? (a) 900 (b) 1000 (c) 1200 (d) 1100
  33. 33.Which is closest to 1993 ÷ 41? (a) 50 (b) 25 (c) 100 (d) 500
  34. 34.Round 64431 to the nearest ten.
  35. 35.Which is closest to 896 × 29? (Round each number first.) (a) 54000 (b) 2700 (c) 270000 (d) 27000
  36. 36.Which is closest to 397 × 32? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  37. 37.Round 24.09 to one decimal place. =
  38. 38.Which is closest to 1503 ÷ 29? (a) 25 (b) 50 (c) 100 (d) 500
  39. 39.Which is closest to 803 × 78? (Round each number first.) (a) 640000 (b) 128000 (c) 64000 (d) 6400
  40. 40.Round 22.69 to one decimal place. =

Answer key

  1. 20
  2. 49280
  3. 70
  4. 1300
  5. 1100
  6. 11.7
  7. 1720
  8. 21000
  9. 25000
  10. 38.8
  11. 91.6
  12. 48200
  13. 23.7
  14. 1800
  15. 20
  16. 51.6
  17. 61.6
  18. 16.9
  19. 45.7
  20. 93930
  21. 4000
  22. 9000
  23. 65000
  24. 42620
  25. 12000
  26. 1500
  27. 1600
  28. 60.5
  29. 900
  30. 25000
  31. 14.3
  32. 1000
  33. 50
  34. 64430
  35. 27000
  36. 12000
  37. 24.1
  38. 50
  39. 64000
  40. 22.7

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