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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 42 · 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 596 + 405 + 599? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  2. 2.Round 18.42 to one decimal place. =
  3. 3.Round 11.29 to one decimal place. =
  4. 4.Which is closest to 398 × 30? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  5. 5.Which is closest to 397 × 22? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  6. 6.Which is closest to 2106 ÷ 31? (a) 140 (b) 700 (c) 35 (d) 70
  7. 7.Which is closest to 1607 ÷ 19? (a) 80 (b) 40 (c) 160 (d) 800
  8. 8.Round 16.51 to one decimal place. =
  9. 9.Which is closest to 96 + 798 + 598? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  10. 10.Which is closest to 701 × 68? (Round each number first.) (a) 490000 (b) 4900 (c) 98000 (d) 49000
  11. 11.Which is closest to 998 ÷ 49? (a) 40 (b) 20 (c) 10 (d) 200
  12. 12.Round 36740 to the nearest hundred.
  13. 13.Round 56.93 to one decimal place. =
  14. 14.Which is closest to 2092 ÷ 31? (a) 70 (b) 700 (c) 140 (d) 35
  15. 15.Which is closest to 603 × 59? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  16. 16.Which is closest to 804 ÷ 41? (a) 20 (b) 10 (c) 200 (d) 40
  17. 17.Which is closest to 2806 ÷ 39? (a) 700 (b) 70 (c) 35 (d) 140
  18. 18.Round 94.87 to one decimal place. =
  19. 19.Round 83.94 to one decimal place. =
  20. 20.Which is closest to 300 × 18? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  21. 21.Which is closest to 1998 ÷ 39? (a) 25 (b) 50 (c) 100 (d) 500
  22. 22.Round 61.32 to one decimal place. =
  23. 23.Which is closest to 1595 ÷ 21? (a) 40 (b) 160 (c) 800 (d) 80
  24. 24.Round 93055 to the nearest hundred.
  25. 25.Which is closest to 903 × 62? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
  26. 26.Round 81.37 to one decimal place. =
  27. 27.Which is closest to 597 × 41? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  28. 28.Which is closest to 597 × 82? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  29. 29.Which is closest to 597 ÷ 29? (a) 20 (b) 10 (c) 200 (d) 40
  30. 30.Round 53567 to the nearest hundred.
  31. 31.Which is closest to 502 + 299 + 702? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  32. 32.Round 62146 to the nearest thousand.
  33. 33.Round 90.44 to one decimal place. =
  34. 34.Round 92.24 to one decimal place. =
  35. 35.Which is closest to 502 × 52? (Round each number first.) (a) 25000 (b) 50000 (c) 2500 (d) 250000
  36. 36.Which is closest to 300 + 95 + 203? (a) 700 (b) 500 (c) 800 (d) 600
  37. 37.Which is closest to 803 × 91? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  38. 38.Which is closest to 1793 ÷ 29? (a) 30 (b) 60 (c) 120 (d) 600
  39. 39.Round 96.06 to one decimal place. =
  40. 40.Which is closest to 400 × 18? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000

Answer key

  1. 1600
  2. 18.4
  3. 11.3
  4. 12000
  5. 8000
  6. 70
  7. 80
  8. 16.5
  9. 1500
  10. 49000
  11. 20
  12. 36700
  13. 56.9
  14. 70
  15. 36000
  16. 20
  17. 70
  18. 94.9
  19. 83.9
  20. 6000
  21. 50
  22. 61.3
  23. 80
  24. 93100
  25. 54000
  26. 81.4
  27. 24000
  28. 48000
  29. 20
  30. 53600
  31. 1500
  32. 62000
  33. 90.4
  34. 92.2
  35. 25000
  36. 600
  37. 72000
  38. 60
  39. 96.1
  40. 8000

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