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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 518 · 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 67.49 to one decimal place. =
  2. 2.Which is closest to 1495 ÷ 29? (a) 500 (b) 50 (c) 25 (d) 100
  3. 3.Which is closest to 1006 ÷ 49? (a) 20 (b) 10 (c) 200 (d) 40
  4. 4.Which is closest to 402 × 29? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  5. 5.Which is closest to 304 + 203 + 699? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  6. 6.Round 48574 to the nearest ten.
  7. 7.Round 39.37 to one decimal place. =
  8. 8.Round 68449 to the nearest thousand.
  9. 9.Round 30.28 to one decimal place. =
  10. 10.Which is closest to 396 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  11. 11.Which is closest to 1500 ÷ 29? (a) 100 (b) 25 (c) 500 (d) 50
  12. 12.Round 56096 to the nearest thousand.
  13. 13.Which is closest to 1192 ÷ 29? (a) 20 (b) 40 (c) 80 (d) 400
  14. 14.Which is closest to 3603 ÷ 39? (a) 45 (b) 180 (c) 900 (d) 90
  15. 15.Which is closest to 599 × 29? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  16. 16.Which is closest to 1002 ÷ 19? (a) 100 (b) 500 (c) 50 (d) 25
  17. 17.Which is closest to 105 + 305 + 298? (a) 600 (b) 700 (c) 900 (d) 800
  18. 18.Which is closest to 602 + 501 + 202? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  19. 19.Which is closest to 1803 ÷ 29? (a) 120 (b) 600 (c) 30 (d) 60
  20. 20.Which is closest to 905 + 105 + 205? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  21. 21.Which is closest to 1804 ÷ 31? (a) 120 (b) 30 (c) 60 (d) 600
  22. 22.Which is closest to 302 + 503 + 400? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  23. 23.Round 23.73 to one decimal place. =
  24. 24.Which is closest to 603 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  25. 25.Which is closest to 1202 ÷ 21? (a) 30 (b) 600 (c) 120 (d) 60
  26. 26.Which is closest to 698 × 28? (Round each number first.) (a) 21000 (b) 210000 (c) 42000 (d) 2100
  27. 27.Round 72.83 to one decimal place. =
  28. 28.Which is closest to 296 × 69? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
  29. 29.Which is closest to 903 × 21? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  30. 30.Which is closest to 201 × 40? (Round each number first.) (a) 8000 (b) 16000 (c) 800 (d) 80000
  31. 31.Which is closest to 700 + 299 + 197? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  32. 32.Which is closest to 1194 ÷ 39? (a) 15 (b) 60 (c) 300 (d) 30
  33. 33.Which is closest to 897 + 904 + 901? (a) 2900 (b) 2800 (c) 2600 (d) 2700
  34. 34.Round 28.83 to one decimal place. =
  35. 35.Which is closest to 999 ÷ 49? (a) 40 (b) 10 (c) 200 (d) 20
  36. 36.Which is closest to 496 × 58? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  37. 37.Round 35682 to the nearest hundred.
  38. 38.Which is closest to 2407 ÷ 41? (a) 60 (b) 600 (c) 30 (d) 120
  39. 39.Round 56917 to the nearest ten.
  40. 40.Which is closest to 303 × 20? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000

Answer key

  1. 67.5
  2. 50
  3. 20
  4. 12000
  5. 1200
  6. 48570
  7. 39.4
  8. 68000
  9. 30.3
  10. 20
  11. 50
  12. 56000
  13. 40
  14. 90
  15. 18000
  16. 50
  17. 700
  18. 1300
  19. 60
  20. 1200
  21. 60
  22. 1200
  23. 23.7
  24. 20
  25. 60
  26. 21000
  27. 72.8
  28. 21000
  29. 18000
  30. 8000
  31. 1200
  32. 30
  33. 2700
  34. 28.8
  35. 20
  36. 30000
  37. 35700
  38. 60
  39. 56920
  40. 6000

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