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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 386 · 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 608 ÷ 31? (a) 200 (b) 20 (c) 40 (d) 10
  2. 2.Which is closest to 2791 ÷ 39? (a) 35 (b) 140 (c) 700 (d) 70
  3. 3.Which is closest to 204 × 28? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  4. 4.Which is closest to 495 + 200 + 397? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  5. 5.Round 6345 to the nearest thousand.
  6. 6.Round 95.72 to one decimal place. =
  7. 7.Round 89559 to the nearest hundred.
  8. 8.Which is closest to 196 × 28? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  9. 9.Which is closest to 498 × 78? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  10. 10.Which is closest to 1593 ÷ 19? (a) 80 (b) 40 (c) 160 (d) 800
  11. 11.Which is closest to 1492 ÷ 51? (a) 300 (b) 15 (c) 30 (d) 60
  12. 12.Round 43.18 to one decimal place. =
  13. 13.Round 7179 to the nearest thousand.
  14. 14.Which is closest to 697 × 22? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
  15. 15.Which is closest to 1603 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  16. 16.Which is closest to 95 + 905 + 800? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  17. 17.Which is closest to 598 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  18. 18.Round 52164 to the nearest ten.
  19. 19.Round 23070 to the nearest thousand.
  20. 20.Round 43387 to the nearest hundred.
  21. 21.Which is closest to 203 × 88? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  22. 22.Round 38527 to the nearest hundred.
  23. 23.Round 68.43 to one decimal place. =
  24. 24.Round 67185 to the nearest hundred.
  25. 25.Which is closest to 700 × 91? (Round each number first.) (a) 63000 (b) 6300 (c) 630000 (d) 126000
  26. 26.Round 37.46 to one decimal place. =
  27. 27.Round 48.63 to one decimal place. =
  28. 28.Which is closest to 196 + 299 + 495? (a) 900 (b) 1200 (c) 1000 (d) 1100
  29. 29.Which is closest to 1498 ÷ 49? (a) 30 (b) 60 (c) 15 (d) 300
  30. 30.Round 35.76 to one decimal place. =
  31. 31.Round 58.83 to one decimal place. =
  32. 32.Which is closest to 495 + 303 + 699? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  33. 33.Which is closest to 2508 ÷ 49? (a) 50 (b) 100 (c) 500 (d) 25
  34. 34.Which is closest to 396 × 39? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  35. 35.Which is closest to 1003 ÷ 19? (a) 50 (b) 25 (c) 100 (d) 500
  36. 36.Round 70.88 to one decimal place. =
  37. 37.Round 83.18 to one decimal place. =
  38. 38.Round 16.73 to one decimal place. =
  39. 39.Round 13596 to the nearest hundred.
  40. 40.Which is closest to 495 + 797 + 702? (a) 2200 (b) 1900 (c) 2100 (d) 2000

Answer key

  1. 20
  2. 70
  3. 6000
  4. 1100
  5. 6000
  6. 95.7
  7. 89600
  8. 6000
  9. 40000
  10. 80
  11. 30
  12. 43.2
  13. 7000
  14. 14000
  15. 40
  16. 1800
  17. 30
  18. 52160
  19. 23000
  20. 43400
  21. 18000
  22. 38500
  23. 68.4
  24. 67200
  25. 63000
  26. 37.5
  27. 48.6
  28. 1000
  29. 30
  30. 35.8
  31. 58.8
  32. 1500
  33. 50
  34. 16000
  35. 50
  36. 70.9
  37. 83.2
  38. 16.7
  39. 13600
  40. 2000

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