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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 654 · 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 703 × 32? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  2. 2.Round 72862 to the nearest thousand.
  3. 3.Which is closest to 298 × 38? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  4. 4.Round 94.54 to one decimal place. =
  5. 5.Which is closest to 908 ÷ 29? (a) 15 (b) 60 (c) 300 (d) 30
  6. 6.Which is closest to 596 + 199 + 201? (a) 1200 (b) 1100 (c) 900 (d) 1000
  7. 7.Which is closest to 400 × 82? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  8. 8.Which is closest to 3200 ÷ 39? (a) 160 (b) 800 (c) 80 (d) 40
  9. 9.Which is closest to 2399 ÷ 41? (a) 600 (b) 30 (c) 60 (d) 120
  10. 10.Round 61.77 to one decimal place. =
  11. 11.Round 16.62 to one decimal place. =
  12. 12.Round 19756 to the nearest thousand.
  13. 13.Round 39162 to the nearest thousand.
  14. 14.Round 10369 to the nearest thousand.
  15. 15.Round 73358 to the nearest hundred.
  16. 16.Which is closest to 698 × 62? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  17. 17.Round 63.41 to one decimal place. =
  18. 18.Round 24.54 to one decimal place. =
  19. 19.Round 11.46 to one decimal place. =
  20. 20.Which is closest to 396 × 51? (Round each number first.) (a) 2000 (b) 20000 (c) 40000 (d) 200000
  21. 21.Which is closest to 905 + 900 + 296? (a) 2200 (b) 2300 (c) 2100 (d) 2000
  22. 22.Which is closest to 1203 ÷ 39? (a) 300 (b) 30 (c) 15 (d) 60
  23. 23.Which is closest to 396 × 21? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  24. 24.Which is closest to 500 + 703 + 296? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  25. 25.Round 21308 to the nearest hundred.
  26. 26.Round 92830 to the nearest thousand.
  27. 27.Which is closest to 605 ÷ 19? (a) 300 (b) 30 (c) 60 (d) 15
  28. 28.Which is closest to 496 × 91? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  29. 29.Round 88.89 to one decimal place. =
  30. 30.Which is closest to 296 + 102 + 401? (a) 900 (b) 800 (c) 700 (d) 1000
  31. 31.Round 4108 to the nearest thousand.
  32. 32.Round 16.57 to one decimal place. =
  33. 33.Which is closest to 2797 ÷ 41? (a) 70 (b) 35 (c) 140 (d) 700
  34. 34.Which is closest to 496 × 71? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  35. 35.Round 30570 to the nearest hundred.
  36. 36.Round 21.62 to one decimal place. =
  37. 37.Which is closest to 595 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  38. 38.Which is closest to 801 × 18? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  39. 39.Round 64068 to the nearest ten.
  40. 40.Which is closest to 295 + 805 + 602? (a) 1800 (b) 1700 (c) 1600 (d) 1900

Answer key

  1. 21000
  2. 73000
  3. 12000
  4. 94.5
  5. 30
  6. 1000
  7. 32000
  8. 80
  9. 60
  10. 61.8
  11. 16.6
  12. 20000
  13. 39000
  14. 10000
  15. 73400
  16. 42000
  17. 63.4
  18. 24.5
  19. 11.5
  20. 20000
  21. 2100
  22. 30
  23. 8000
  24. 1500
  25. 21300
  26. 93000
  27. 30
  28. 45000
  29. 88.9
  30. 800
  31. 4000
  32. 16.6
  33. 70
  34. 35000
  35. 30600
  36. 21.6
  37. 30
  38. 16000
  39. 64070
  40. 1700

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