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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 708 · 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 48126 to the nearest hundred.
  2. 2.Round 66.47 to one decimal place. =
  3. 3.Which is closest to 795 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
  4. 4.Which is closest to 297 × 58? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  5. 5.Which is closest to 896 × 62? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  6. 6.Which is closest to 596 ÷ 31? (a) 200 (b) 20 (c) 40 (d) 10
  7. 7.Which is closest to 805 + 596 + 602? (a) 1900 (b) 2000 (c) 2200 (d) 2100
  8. 8.Round 25.28 to one decimal place. =
  9. 9.Which is closest to 902 × 20? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  10. 10.Which is closest to 3002 ÷ 51? (a) 600 (b) 60 (c) 120 (d) 30
  11. 11.Round 52818 to the nearest ten.
  12. 12.Which is closest to 395 + 298 + 198? (a) 1000 (b) 1100 (c) 900 (d) 800
  13. 13.Which is closest to 595 ÷ 21? (a) 15 (b) 30 (c) 60 (d) 300
  14. 14.Round 29.77 to one decimal place. =
  15. 15.Which is closest to 395 ÷ 21? (a) 20 (b) 200 (c) 10 (d) 40
  16. 16.Round 41.19 to one decimal place. =
  17. 17.Round 24.77 to one decimal place. =
  18. 18.Which is closest to 705 + 299 + 495? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  19. 19.Which is closest to 900 + 796 + 304? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  20. 20.Round 28.77 to one decimal place. =
  21. 21.Round 41.84 to one decimal place. =
  22. 22.Which is closest to 105 + 104 + 598? (a) 700 (b) 900 (c) 800 (d) 1000
  23. 23.Round 88798 to the nearest ten.
  24. 24.Round 32157 to the nearest hundred.
  25. 25.Which is closest to 601 × 90? (Round each number first.) (a) 5400 (b) 54000 (c) 540000 (d) 108000
  26. 26.Which is closest to 1797 ÷ 19? (a) 45 (b) 900 (c) 90 (d) 180
  27. 27.Round 53166 to the nearest thousand.
  28. 28.Round 74.09 to one decimal place. =
  29. 29.Which is closest to 3606 ÷ 39? (a) 90 (b) 900 (c) 45 (d) 180
  30. 30.Round 96385 to the nearest hundred.
  31. 31.Which is closest to 699 × 81? (Round each number first.) (a) 560000 (b) 56000 (c) 112000 (d) 5600
  32. 32.Which is closest to 391 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  33. 33.Which is closest to 905 + 297 + 403? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  34. 34.Which is closest to 1003 ÷ 21? (a) 50 (b) 100 (c) 25 (d) 500
  35. 35.Which is closest to 104 + 699 + 497? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  36. 36.Round 26.36 to one decimal place. =
  37. 37.Which is closest to 502 + 801 + 695? (a) 2100 (b) 2200 (c) 2000 (d) 1900
  38. 38.Which is closest to 1608 ÷ 19? (a) 40 (b) 160 (c) 80 (d) 800
  39. 39.Round 78837 to the nearest ten.
  40. 40.Which is closest to 598 × 78? (Round each number first.) (a) 96000 (b) 48000 (c) 480000 (d) 4800

Answer key

  1. 48100
  2. 66.5
  3. 20
  4. 18000
  5. 54000
  6. 20
  7. 2000
  8. 25.3
  9. 18000
  10. 60
  11. 52820
  12. 900
  13. 30
  14. 29.8
  15. 20
  16. 41.2
  17. 24.8
  18. 1500
  19. 2000
  20. 28.8
  21. 41.8
  22. 800
  23. 88800
  24. 32200
  25. 54000
  26. 90
  27. 53000
  28. 74.1
  29. 90
  30. 96400
  31. 56000
  32. 20
  33. 1600
  34. 50
  35. 1300
  36. 26.4
  37. 2000
  38. 80
  39. 78840
  40. 48000

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