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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 626 · 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 903 × 58? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  2. 2.Which is closest to 103 + 298 + 195? (a) 800 (b) 700 (c) 500 (d) 600
  3. 3.Which is closest to 498 × 38? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  4. 4.Round 55.28 to one decimal place. =
  5. 5.Which is closest to 900 × 51? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  6. 6.Which is closest to 601 + 402 + 404? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  7. 7.Which is closest to 1804 ÷ 19? (a) 180 (b) 900 (c) 90 (d) 45
  8. 8.Which is closest to 4492 ÷ 49? (a) 180 (b) 900 (c) 45 (d) 90
  9. 9.Which is closest to 1009 ÷ 51? (a) 20 (b) 200 (c) 40 (d) 10
  10. 10.Which is closest to 496 × 51? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  11. 11.Round 23.83 to one decimal place. =
  12. 12.Which is closest to 895 + 898 + 104? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  13. 13.Which is closest to 202 × 48? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
  14. 14.Round 57.62 to one decimal place. =
  15. 15.Round 92894 to the nearest ten.
  16. 16.Which is closest to 100 + 405 + 295? (a) 800 (b) 900 (c) 1000 (d) 700
  17. 17.Round 57.26 to one decimal place. =
  18. 18.Round 40.63 to one decimal place. =
  19. 19.Which is closest to 1002 ÷ 19? (a) 500 (b) 50 (c) 25 (d) 100
  20. 20.Round 45178 to the nearest ten.
  21. 21.Which is closest to 899 × 78? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  22. 22.Which is closest to 595 + 96 + 201? (a) 800 (b) 1100 (c) 1000 (d) 900
  23. 23.Which is closest to 696 × 82? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  24. 24.Round 96.31 to one decimal place. =
  25. 25.Which is closest to 303 + 201 + 295? (a) 1000 (b) 700 (c) 800 (d) 900
  26. 26.Which is closest to 896 × 51? (Round each number first.) (a) 4500 (b) 450000 (c) 45000 (d) 90000
  27. 27.Round 36.89 to one decimal place. =
  28. 28.Round 75330 to the nearest hundred.
  29. 29.Round 45.08 to one decimal place. =
  30. 30.Round 37641 to the nearest thousand.
  31. 31.Which is closest to 704 × 90? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  32. 32.Which is closest to 296 + 499 + 202? (a) 1200 (b) 1000 (c) 1100 (d) 900
  33. 33.Round 25.81 to one decimal place. =
  34. 34.Which is closest to 1204 ÷ 29? (a) 40 (b) 400 (c) 20 (d) 80
  35. 35.Round 29273 to the nearest ten.
  36. 36.Which is closest to 598 + 102 + 899? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  37. 37.Which is closest to 895 + 100 + 199? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  38. 38.Round 74.68 to one decimal place. =
  39. 39.Round 46417 to the nearest ten.
  40. 40.Which is closest to 800 × 49? (Round each number first.) (a) 4000 (b) 80000 (c) 400000 (d) 40000

Answer key

  1. 54000
  2. 600
  3. 20000
  4. 55.3
  5. 45000
  6. 1400
  7. 90
  8. 90
  9. 20
  10. 25000
  11. 23.8
  12. 1900
  13. 10000
  14. 57.6
  15. 92890
  16. 800
  17. 57.3
  18. 40.6
  19. 50
  20. 45180
  21. 72000
  22. 900
  23. 56000
  24. 96.3
  25. 800
  26. 45000
  27. 36.9
  28. 75300
  29. 45.1
  30. 38000
  31. 63000
  32. 1000
  33. 25.8
  34. 40
  35. 29270
  36. 1600
  37. 1200
  38. 74.7
  39. 46420
  40. 40000

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