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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 614 · 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 197 + 96 + 600? (a) 1000 (b) 900 (c) 1100 (d) 800
  2. 2.Which is closest to 1207 ÷ 29? (a) 80 (b) 400 (c) 20 (d) 40
  3. 3.Which is closest to 498 + 603 + 598? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  4. 4.Which is closest to 4491 ÷ 51? (a) 90 (b) 180 (c) 45 (d) 900
  5. 5.Which is closest to 609 ÷ 31? (a) 200 (b) 10 (c) 40 (d) 20
  6. 6.Round 41.11 to one decimal place. =
  7. 7.Round 69.64 to one decimal place. =
  8. 8.Which is closest to 802 × 38? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  9. 9.Which is closest to 1604 ÷ 19? (a) 800 (b) 160 (c) 80 (d) 40
  10. 10.Round 10.12 to one decimal place. =
  11. 11.Which is closest to 499 × 71? (Round each number first.) (a) 35000 (b) 70000 (c) 350000 (d) 3500
  12. 12.Round 19.83 to one decimal place. =
  13. 13.Round 93627 to the nearest ten.
  14. 14.Which is closest to 1493 ÷ 31? (a) 25 (b) 50 (c) 500 (d) 100
  15. 15.Round 80.89 to one decimal place. =
  16. 16.Which is closest to 401 + 497 + 202? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  17. 17.Which is closest to 1009 ÷ 51? (a) 20 (b) 10 (c) 200 (d) 40
  18. 18.Which is closest to 97 + 702 + 204? (a) 900 (b) 1000 (c) 1200 (d) 1100
  19. 19.Round 60929 to the nearest hundred.
  20. 20.Which is closest to 803 + 695 + 97? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  21. 21.Which is closest to 905 + 199 + 201? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  22. 22.Round 24817 to the nearest ten.
  23. 23.Which is closest to 105 + 398 + 401? (a) 800 (b) 1100 (c) 900 (d) 1000
  24. 24.Round 66566 to the nearest ten.
  25. 25.Which is closest to 403 + 805 + 303? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  26. 26.Which is closest to 601 + 495 + 301? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  27. 27.Round 52910 to the nearest hundred.
  28. 28.Which is closest to 3596 ÷ 41? (a) 180 (b) 900 (c) 45 (d) 90
  29. 29.Which is closest to 99 + 105 + 601? (a) 700 (b) 1000 (c) 900 (d) 800
  30. 30.Round 31778 to the nearest ten.
  31. 31.Which is closest to 1797 ÷ 21? (a) 180 (b) 45 (c) 900 (d) 90
  32. 32.Which is closest to 601 + 696 + 801? (a) 2000 (b) 2100 (c) 2300 (d) 2200
  33. 33.Which is closest to 297 × 22? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  34. 34.Round 84136 to the nearest thousand.
  35. 35.Round 82453 to the nearest thousand.
  36. 36.Which is closest to 901 × 88? (Round each number first.) (a) 8100 (b) 81000 (c) 810000 (d) 162000
  37. 37.Which is closest to 2797 ÷ 39? (a) 140 (b) 700 (c) 70 (d) 35
  38. 38.Round 97486 to the nearest ten.
  39. 39.Which is closest to 903 × 39? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  40. 40.Which is closest to 497 × 32? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500

Answer key

  1. 900
  2. 40
  3. 1700
  4. 90
  5. 20
  6. 41.1
  7. 69.6
  8. 32000
  9. 80
  10. 10.1
  11. 35000
  12. 19.8
  13. 93630
  14. 50
  15. 80.9
  16. 1100
  17. 20
  18. 1000
  19. 60900
  20. 1600
  21. 1300
  22. 24820
  23. 900
  24. 66570
  25. 1500
  26. 1400
  27. 52900
  28. 90
  29. 800
  30. 31780
  31. 90
  32. 2100
  33. 6000
  34. 84000
  35. 82000
  36. 81000
  37. 70
  38. 97490
  39. 36000
  40. 15000

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