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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 568 · 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 3994 ÷ 51? (a) 160 (b) 40 (c) 800 (d) 80
  2. 2.Which is closest to 1202 ÷ 31? (a) 400 (b) 40 (c) 80 (d) 20
  3. 3.Round 59.68 to one decimal place. =
  4. 4.Round 76.81 to one decimal place. =
  5. 5.Which is closest to 798 + 700 + 797? (a) 2200 (b) 2500 (c) 2300 (d) 2400
  6. 6.Round 95.47 to one decimal place. =
  7. 7.Round 23627 to the nearest hundred.
  8. 8.Round 81039 to the nearest thousand.
  9. 9.Round 31.19 to one decimal place. =
  10. 10.Round 50195 to the nearest thousand.
  11. 11.Which is closest to 296 × 19? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  12. 12.Round 96641 to the nearest thousand.
  13. 13.Which is closest to 504 × 90? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  14. 14.Round 57107 to the nearest hundred.
  15. 15.Which is closest to 696 × 59? (Round each number first.) (a) 84000 (b) 420000 (c) 4200 (d) 42000
  16. 16.Round 62939 to the nearest ten.
  17. 17.Which is closest to 2796 ÷ 41? (a) 140 (b) 700 (c) 35 (d) 70
  18. 18.Round 92632 to the nearest thousand.
  19. 19.Which is closest to 300 × 39? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  20. 20.Which is closest to 604 + 205 + 703? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  21. 21.Which is closest to 802 + 98 + 704? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  22. 22.Round 9464 to the nearest ten.
  23. 23.Which is closest to 605 + 800 + 98? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  24. 24.Which is closest to 201 × 29? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  25. 25.Which is closest to 1793 ÷ 21? (a) 90 (b) 900 (c) 180 (d) 45
  26. 26.Round 49.34 to one decimal place. =
  27. 27.Which is closest to 297 × 20? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  28. 28.Round 77245 to the nearest hundred.
  29. 29.Round 68007 to the nearest hundred.
  30. 30.Round 31692 to the nearest ten.
  31. 31.Which is closest to 903 × 59? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
  32. 32.Which is closest to 898 × 19? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  33. 33.Round 73711 to the nearest thousand.
  34. 34.Which is closest to 396 × 71? (Round each number first.) (a) 56000 (b) 280000 (c) 28000 (d) 2800
  35. 35.Which is closest to 203 + 696 + 398? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  36. 36.Round 12.44 to one decimal place. =
  37. 37.Round 91.66 to one decimal place. =
  38. 38.Round 40.13 to one decimal place. =
  39. 39.Which is closest to 196 + 903 + 399? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  40. 40.Which is closest to 796 × 40? (Round each number first.) (a) 32000 (b) 64000 (c) 3200 (d) 320000

Answer key

  1. 80
  2. 40
  3. 59.7
  4. 76.8
  5. 2300
  6. 95.5
  7. 23600
  8. 81000
  9. 31.2
  10. 50000
  11. 6000
  12. 97000
  13. 45000
  14. 57100
  15. 42000
  16. 62940
  17. 70
  18. 93000
  19. 12000
  20. 1500
  21. 1600
  22. 9460
  23. 1500
  24. 6000
  25. 90
  26. 49.3
  27. 6000
  28. 77200
  29. 68000
  30. 31690
  31. 54000
  32. 18000
  33. 74000
  34. 28000
  35. 1300
  36. 12.4
  37. 91.7
  38. 40.1
  39. 1500
  40. 32000

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