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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 581 · 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 55722 to the nearest hundred.
  2. 2.Which is closest to 699 + 104 + 203? (a) 1200 (b) 900 (c) 1100 (d) 1000
  3. 3.Round 64.36 to one decimal place. =
  4. 4.Round 16483 to the nearest ten.
  5. 5.Which is closest to 403 × 32? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  6. 6.Which is closest to 197 × 22? (Round each number first.) (a) 40000 (b) 8000 (c) 400 (d) 4000
  7. 7.Which is closest to 2993 ÷ 51? (a) 600 (b) 120 (c) 60 (d) 30
  8. 8.Which is closest to 197 × 29? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  9. 9.Which is closest to 405 + 402 + 897? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  10. 10.Which is closest to 399 × 18? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
  11. 11.Round 25.23 to one decimal place. =
  12. 12.Round 93492 to the nearest ten.
  13. 13.Round 21.46 to one decimal place. =
  14. 14.Which is closest to 401 × 78? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
  15. 15.Which is closest to 903 × 69? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  16. 16.Which is closest to 1002 ÷ 19? (a) 50 (b) 500 (c) 100 (d) 25
  17. 17.Which is closest to 503 × 88? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
  18. 18.Which is closest to 902 + 900 + 902? (a) 2700 (b) 2800 (c) 2900 (d) 2600
  19. 19.Which is closest to 897 × 59? (Round each number first.) (a) 108000 (b) 5400 (c) 54000 (d) 540000
  20. 20.Which is closest to 396 + 599 + 98? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  21. 21.Round 88538 to the nearest thousand.
  22. 22.Which is closest to 602 + 299 + 601? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  23. 23.Which is closest to 299 × 22? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  24. 24.Which is closest to 1595 ÷ 41? (a) 80 (b) 400 (c) 40 (d) 20
  25. 25.Round 29.28 to one decimal place. =
  26. 26.Round 80.38 to one decimal place. =
  27. 27.Which is closest to 297 × 60? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  28. 28.Round 46.11 to one decimal place. =
  29. 29.Round 84.71 to one decimal place. =
  30. 30.Which is closest to 1994 ÷ 41? (a) 500 (b) 25 (c) 100 (d) 50
  31. 31.Round 81148 to the nearest thousand.
  32. 32.Round 55.33 to one decimal place. =
  33. 33.Which is closest to 1395 ÷ 21? (a) 140 (b) 700 (c) 70 (d) 35
  34. 34.Which is closest to 900 + 801 + 100? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  35. 35.Round 99.88 to one decimal place. =
  36. 36.Which is closest to 704 × 29? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  37. 37.Which is closest to 798 × 40? (Round each number first.) (a) 32000 (b) 3200 (c) 64000 (d) 320000
  38. 38.Which is closest to 801 + 105 + 605? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  39. 39.Which is closest to 1594 ÷ 39? (a) 80 (b) 20 (c) 400 (d) 40
  40. 40.Which is closest to 402 × 20? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000

Answer key

  1. 55700
  2. 1000
  3. 64.4
  4. 16480
  5. 12000
  6. 4000
  7. 60
  8. 6000
  9. 1700
  10. 8000
  11. 25.2
  12. 93490
  13. 21.5
  14. 32000
  15. 63000
  16. 50
  17. 45000
  18. 2700
  19. 54000
  20. 1100
  21. 89000
  22. 1500
  23. 6000
  24. 40
  25. 29.3
  26. 80.4
  27. 18000
  28. 46.1
  29. 84.7
  30. 50
  31. 81000
  32. 55.3
  33. 70
  34. 1800
  35. 99.9
  36. 21000
  37. 32000
  38. 1500
  39. 40
  40. 8000

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