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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 628 · 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 699 × 38? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  2. 2.Round 12543 to the nearest ten.
  3. 3.Round 47.68 to one decimal place. =
  4. 4.Round 40.77 to one decimal place. =
  5. 5.Which is closest to 3205 ÷ 39? (a) 160 (b) 80 (c) 800 (d) 40
  6. 6.Which is closest to 904 × 58? (Round each number first.) (a) 5400 (b) 108000 (c) 54000 (d) 540000
  7. 7.Which is closest to 799 × 58? (Round each number first.) (a) 480000 (b) 48000 (c) 96000 (d) 4800
  8. 8.Which is closest to 603 × 79? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  9. 9.Which is closest to 404 + 95 + 498? (a) 1000 (b) 900 (c) 1100 (d) 1200
  10. 10.Which is closest to 304 + 598 + 305? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  11. 11.Which is closest to 398 + 603 + 503? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  12. 12.Which is closest to 198 × 89? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  13. 13.Which is closest to 605 + 599 + 799? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  14. 14.Which is closest to 699 × 71? (Round each number first.) (a) 98000 (b) 49000 (c) 4900 (d) 490000
  15. 15.Which is closest to 600 × 81? (Round each number first.) (a) 4800 (b) 96000 (c) 48000 (d) 480000
  16. 16.Round 65426 to the nearest hundred.
  17. 17.Which is closest to 800 + 702 + 804? (a) 2500 (b) 2400 (c) 2200 (d) 2300
  18. 18.Round 23.87 to one decimal place. =
  19. 19.Round 85.27 to one decimal place. =
  20. 20.Which is closest to 696 + 499 + 204? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  21. 21.Which is closest to 597 ÷ 19? (a) 30 (b) 15 (c) 60 (d) 300
  22. 22.Which is closest to 99 + 897 + 103? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  23. 23.Round 92.48 to one decimal place. =
  24. 24.Which is closest to 902 + 696 + 399? (a) 2100 (b) 1900 (c) 2000 (d) 2200
  25. 25.Round 40114 to the nearest hundred.
  26. 26.Which is closest to 1209 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  27. 27.Which is closest to 2404 ÷ 39? (a) 600 (b) 60 (c) 30 (d) 120
  28. 28.Which is closest to 198 + 702 + 703? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  29. 29.Round 78.58 to one decimal place. =
  30. 30.Which is closest to 701 × 80? (Round each number first.) (a) 56000 (b) 560000 (c) 112000 (d) 5600
  31. 31.Round 53.11 to one decimal place. =
  32. 32.Which is closest to 1797 ÷ 21? (a) 900 (b) 180 (c) 45 (d) 90
  33. 33.Which is closest to 103 + 696 + 804? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  34. 34.Which is closest to 296 × 32? (Round each number first.) (a) 18000 (b) 90000 (c) 9000 (d) 900
  35. 35.Which is closest to 997 ÷ 21? (a) 25 (b) 50 (c) 500 (d) 100
  36. 36.Which is closest to 396 × 41? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  37. 37.Which is closest to 2493 ÷ 51? (a) 100 (b) 25 (c) 500 (d) 50
  38. 38.Which is closest to 2104 ÷ 29? (a) 140 (b) 70 (c) 700 (d) 35
  39. 39.Which is closest to 2100 ÷ 31? (a) 140 (b) 700 (c) 70 (d) 35
  40. 40.Which is closest to 498 + 803 + 705? (a) 2000 (b) 1900 (c) 2200 (d) 2100

Answer key

  1. 28000
  2. 12540
  3. 47.7
  4. 40.8
  5. 80
  6. 54000
  7. 48000
  8. 48000
  9. 1000
  10. 1200
  11. 1500
  12. 18000
  13. 2000
  14. 49000
  15. 48000
  16. 65400
  17. 2300
  18. 23.9
  19. 85.3
  20. 1400
  21. 30
  22. 1100
  23. 92.5
  24. 2000
  25. 40100
  26. 60
  27. 60
  28. 1600
  29. 78.6
  30. 56000
  31. 53.1
  32. 90
  33. 1600
  34. 9000
  35. 50
  36. 16000
  37. 50
  38. 70
  39. 70
  40. 2000

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