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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 943 · 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 198 × 19? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  2. 2.Which is closest to 2095 ÷ 31? (a) 70 (b) 700 (c) 35 (d) 140
  3. 3.Which is closest to 801 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  4. 4.Which is closest to 99 + 796 + 395? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  5. 5.Round 75.83 to one decimal place. =
  6. 6.Round 35.54 to one decimal place. =
  7. 7.Which is closest to 903 × 28? (Round each number first.) (a) 2700 (b) 54000 (c) 27000 (d) 270000
  8. 8.Which is closest to 697 + 398 + 201? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  9. 9.Which is closest to 405 ÷ 21? (a) 40 (b) 10 (c) 200 (d) 20
  10. 10.Which is closest to 3599 ÷ 41? (a) 180 (b) 90 (c) 900 (d) 45
  11. 11.Which is closest to 902 + 195 + 197? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  12. 12.Which is closest to 595 + 904 + 305? (a) 1800 (b) 1700 (c) 2000 (d) 1900
  13. 13.Round 23.32 to one decimal place. =
  14. 14.Round 36.48 to one decimal place. =
  15. 15.Which is closest to 2404 ÷ 41? (a) 30 (b) 60 (c) 120 (d) 600
  16. 16.Round 60812 to the nearest ten.
  17. 17.Which is closest to 600 × 41? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  18. 18.Round 38483 to the nearest ten.
  19. 19.Round 15989 to the nearest hundred.
  20. 20.Which is closest to 899 × 72? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  21. 21.Round 44.77 to one decimal place. =
  22. 22.Round 14.59 to one decimal place. =
  23. 23.Which is closest to 697 + 98 + 603? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  24. 24.Round 78.66 to one decimal place. =
  25. 25.Which is closest to 2996 ÷ 49? (a) 120 (b) 30 (c) 60 (d) 600
  26. 26.Round 36.78 to one decimal place. =
  27. 27.Which is closest to 303 × 78? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  28. 28.Round 73881 to the nearest thousand.
  29. 29.Which is closest to 596 ÷ 19? (a) 60 (b) 30 (c) 300 (d) 15
  30. 30.Which is closest to 4493 ÷ 49? (a) 90 (b) 180 (c) 45 (d) 900
  31. 31.Round 56.41 to one decimal place. =
  32. 32.Round 49251 to the nearest ten.
  33. 33.Round 8138 to the nearest ten.
  34. 34.Round 56052 to the nearest thousand.
  35. 35.Round 38486 to the nearest ten.
  36. 36.Round 21.84 to one decimal place. =
  37. 37.Which is closest to 297 + 401 + 396? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  38. 38.Round 73.32 to one decimal place. =
  39. 39.Which is closest to 1606 ÷ 39? (a) 40 (b) 80 (c) 400 (d) 20
  40. 40.Which is closest to 1196 ÷ 21? (a) 30 (b) 120 (c) 600 (d) 60

Answer key

  1. 4000
  2. 70
  3. 16000
  4. 1300
  5. 75.8
  6. 35.5
  7. 27000
  8. 1300
  9. 20
  10. 90
  11. 1300
  12. 1800
  13. 23.3
  14. 36.5
  15. 60
  16. 60810
  17. 24000
  18. 38480
  19. 16000
  20. 63000
  21. 44.8
  22. 14.6
  23. 1400
  24. 78.7
  25. 60
  26. 36.8
  27. 24000
  28. 74000
  29. 30
  30. 90
  31. 56.4
  32. 49250
  33. 8140
  34. 56000
  35. 38490
  36. 21.8
  37. 1100
  38. 73.3
  39. 40
  40. 60

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