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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 930 · 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 897 + 298 + 402? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  2. 2.Round 76102 to the nearest thousand.
  3. 3.Which is closest to 302 × 69? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  4. 4.Round 59.41 to one decimal place. =
  5. 5.Which is closest to 496 × 62? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  6. 6.Which is closest to 808 ÷ 21? (a) 40 (b) 20 (c) 80 (d) 400
  7. 7.Round 33896 to the nearest thousand.
  8. 8.Which is closest to 804 + 401 + 96? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  9. 9.Round 57868 to the nearest hundred.
  10. 10.Round 50962 to the nearest hundred.
  11. 11.Which is closest to 705 + 198 + 502? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  12. 12.Which is closest to 1006 ÷ 51? (a) 10 (b) 20 (c) 200 (d) 40
  13. 13.Which is closest to 398 × 79? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  14. 14.Round 68.76 to one decimal place. =
  15. 15.Round 11.94 to one decimal place. =
  16. 16.Which is closest to 800 × 21? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  17. 17.Which is closest to 801 × 78? (Round each number first.) (a) 640000 (b) 128000 (c) 64000 (d) 6400
  18. 18.Round 87637 to the nearest thousand.
  19. 19.Which is closest to 204 × 72? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  20. 20.Which is closest to 3595 ÷ 39? (a) 90 (b) 45 (c) 180 (d) 900
  21. 21.Which is closest to 699 × 72? (Round each number first.) (a) 98000 (b) 4900 (c) 49000 (d) 490000
  22. 22.Which is closest to 197 + 701 + 705? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  23. 23.Round 92.29 to one decimal place. =
  24. 24.Round 75.09 to one decimal place. =
  25. 25.Round 61.53 to one decimal place. =
  26. 26.Which is closest to 501 × 51? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  27. 27.Which is closest to 395 ÷ 21? (a) 20 (b) 10 (c) 200 (d) 40
  28. 28.Which is closest to 203 × 31? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  29. 29.Which is closest to 300 + 197 + 698? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  30. 30.Round 31531 to the nearest thousand.
  31. 31.Which is closest to 1209 ÷ 19? (a) 120 (b) 600 (c) 60 (d) 30
  32. 32.Round 63.46 to one decimal place. =
  33. 33.Round 17.64 to one decimal place. =
  34. 34.Round 79.27 to one decimal place. =
  35. 35.Which is closest to 3003 ÷ 49? (a) 120 (b) 30 (c) 60 (d) 600
  36. 36.Which is closest to 604 × 71? (Round each number first.) (a) 84000 (b) 4200 (c) 420000 (d) 42000
  37. 37.Which is closest to 1993 ÷ 41? (a) 50 (b) 500 (c) 25 (d) 100
  38. 38.Round 97.52 to one decimal place. =
  39. 39.Which is closest to 298 × 41? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  40. 40.Which is closest to 399 × 20? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000

Answer key

  1. 1600
  2. 76000
  3. 21000
  4. 59.4
  5. 30000
  6. 40
  7. 34000
  8. 1300
  9. 57900
  10. 51000
  11. 1400
  12. 20
  13. 32000
  14. 68.8
  15. 11.9
  16. 16000
  17. 64000
  18. 88000
  19. 14000
  20. 90
  21. 49000
  22. 1600
  23. 92.3
  24. 75.1
  25. 61.5
  26. 25000
  27. 20
  28. 6000
  29. 1200
  30. 32000
  31. 60
  32. 63.5
  33. 17.6
  34. 79.3
  35. 60
  36. 42000
  37. 50
  38. 97.5
  39. 12000
  40. 8000

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