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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 425 · 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 28060 to the nearest thousand.
  2. 2.Which is closest to 2093 ÷ 29? (a) 700 (b) 70 (c) 140 (d) 35
  3. 3.Round 68.38 to one decimal place. =
  4. 4.Which is closest to 1195 ÷ 41? (a) 60 (b) 15 (c) 30 (d) 300
  5. 5.Which is closest to 496 × 32? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  6. 6.Which is closest to 303 × 31? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  7. 7.Round 18.91 to one decimal place. =
  8. 8.Round 5444 to the nearest ten.
  9. 9.Which is closest to 401 + 596 + 295? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  10. 10.Which is closest to 900 + 904 + 198? (a) 2000 (b) 2200 (c) 2100 (d) 1900
  11. 11.Which is closest to 2405 ÷ 31? (a) 160 (b) 800 (c) 40 (d) 80
  12. 12.Which is closest to 696 × 18? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  13. 13.Round 86.93 to one decimal place. =
  14. 14.Round 60371 to the nearest hundred.
  15. 15.Round 13147 to the nearest thousand.
  16. 16.Which is closest to 1206 ÷ 39? (a) 30 (b) 300 (c) 60 (d) 15
  17. 17.Which is closest to 1606 ÷ 41? (a) 80 (b) 40 (c) 400 (d) 20
  18. 18.Which is closest to 597 × 28? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  19. 19.Round 49397 to the nearest thousand.
  20. 20.Which is closest to 105 + 96 + 205? (a) 400 (b) 600 (c) 500 (d) 300
  21. 21.Round 65425 to the nearest hundred.
  22. 22.Which is closest to 697 × 48? (Round each number first.) (a) 70000 (b) 350000 (c) 35000 (d) 3500
  23. 23.Which is closest to 297 + 300 + 800? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  24. 24.Round 63.82 to one decimal place. =
  25. 25.Which is closest to 403 × 92? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  26. 26.Which is closest to 798 × 70? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  27. 27.Round 65818 to the nearest hundred.
  28. 28.Round 89.33 to one decimal place. =
  29. 29.Which is closest to 604 × 38? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  30. 30.Which is closest to 591 ÷ 19? (a) 60 (b) 30 (c) 300 (d) 15
  31. 31.Which is closest to 1398 ÷ 21? (a) 700 (b) 140 (c) 35 (d) 70
  32. 32.Which is closest to 1998 ÷ 51? (a) 80 (b) 400 (c) 20 (d) 40
  33. 33.Which is closest to 498 × 58? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
  34. 34.Which is closest to 98 + 104 + 496? (a) 900 (b) 700 (c) 600 (d) 800
  35. 35.Round 16162 to the nearest hundred.
  36. 36.Which is closest to 2408 ÷ 31? (a) 800 (b) 160 (c) 40 (d) 80
  37. 37.Which is closest to 397 + 905 + 601? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  38. 38.Round 73.67 to one decimal place. =
  39. 39.Which is closest to 2996 ÷ 49? (a) 120 (b) 60 (c) 30 (d) 600
  40. 40.Round 57457 to the nearest ten.

Answer key

  1. 28000
  2. 70
  3. 68.4
  4. 30
  5. 15000
  6. 9000
  7. 18.9
  8. 5440
  9. 1300
  10. 2000
  11. 80
  12. 14000
  13. 86.9
  14. 60400
  15. 13000
  16. 30
  17. 40
  18. 18000
  19. 49000
  20. 400
  21. 65400
  22. 35000
  23. 1400
  24. 63.8
  25. 36000
  26. 56000
  27. 65800
  28. 89.3
  29. 24000
  30. 30
  31. 70
  32. 40
  33. 30000
  34. 700
  35. 16200
  36. 80
  37. 1900
  38. 73.7
  39. 60
  40. 57460

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