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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 556 · 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 39.54 to one decimal place. =
  2. 2.Which is closest to 500 + 202 + 104? (a) 1000 (b) 800 (c) 700 (d) 900
  3. 3.Which is closest to 2101 ÷ 29? (a) 700 (b) 35 (c) 140 (d) 70
  4. 4.Which is closest to 898 + 301 + 397? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  5. 5.Round 98.91 to one decimal place. =
  6. 6.Which is closest to 3008 ÷ 49? (a) 60 (b) 120 (c) 30 (d) 600
  7. 7.Which is closest to 201 × 78? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
  8. 8.Which is closest to 203 × 18? (Round each number first.) (a) 400 (b) 4000 (c) 8000 (d) 40000
  9. 9.Round 29.74 to one decimal place. =
  10. 10.Round 21.17 to one decimal place. =
  11. 11.Which is closest to 805 + 904 + 603? (a) 2400 (b) 2200 (c) 2300 (d) 2500
  12. 12.Round 26693 to the nearest thousand.
  13. 13.Round 4444 to the nearest thousand.
  14. 14.Which is closest to 899 × 50? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
  15. 15.Which is closest to 591 ÷ 31? (a) 10 (b) 40 (c) 200 (d) 20
  16. 16.Which is closest to 398 × 29? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  17. 17.Which is closest to 898 × 40? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  18. 18.Which is closest to 898 + 295 + 404? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  19. 19.Which is closest to 1807 ÷ 29? (a) 60 (b) 600 (c) 30 (d) 120
  20. 20.Which is closest to 600 × 69? (Round each number first.) (a) 42000 (b) 420000 (c) 84000 (d) 4200
  21. 21.Which is closest to 600 + 702 + 598? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  22. 22.Which is closest to 704 × 80? (Round each number first.) (a) 5600 (b) 112000 (c) 56000 (d) 560000
  23. 23.Which is closest to 803 × 79? (Round each number first.) (a) 64000 (b) 640000 (c) 128000 (d) 6400
  24. 24.Which is closest to 304 × 29? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
  25. 25.Which is closest to 696 × 81? (Round each number first.) (a) 560000 (b) 5600 (c) 112000 (d) 56000
  26. 26.Round 25899 to the nearest hundred.
  27. 27.Round 97882 to the nearest ten.
  28. 28.Which is closest to 3596 ÷ 41? (a) 180 (b) 45 (c) 900 (d) 90
  29. 29.Which is closest to 2093 ÷ 29? (a) 35 (b) 700 (c) 140 (d) 70
  30. 30.Which is closest to 497 + 703 + 405? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  31. 31.Which is closest to 302 × 38? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  32. 32.Which is closest to 699 + 404 + 95? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  33. 33.Round 23.31 to one decimal place. =
  34. 34.Round 90.58 to one decimal place. =
  35. 35.Which is closest to 799 + 902 + 897? (a) 2500 (b) 2800 (c) 2600 (d) 2700
  36. 36.Round 68921 to the nearest hundred.
  37. 37.Round 53254 to the nearest thousand.
  38. 38.Round 16.18 to one decimal place. =
  39. 39.Round 68.27 to one decimal place. =
  40. 40.Which is closest to 99 + 402 + 199? (a) 700 (b) 800 (c) 600 (d) 900

Answer key

  1. 39.5
  2. 800
  3. 70
  4. 1600
  5. 98.9
  6. 60
  7. 16000
  8. 4000
  9. 29.7
  10. 21.2
  11. 2300
  12. 27000
  13. 4000
  14. 45000
  15. 20
  16. 12000
  17. 36000
  18. 1600
  19. 60
  20. 42000
  21. 1900
  22. 56000
  23. 64000
  24. 9000
  25. 56000
  26. 25900
  27. 97880
  28. 90
  29. 70
  30. 1600
  31. 12000
  32. 1200
  33. 23.3
  34. 90.6
  35. 2600
  36. 68900
  37. 53000
  38. 16.2
  39. 68.3
  40. 700

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