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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 554 · 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 52532 to the nearest thousand.
  2. 2.Round 47.52 to one decimal place. =
  3. 3.Round 32.38 to one decimal place. =
  4. 4.Which is closest to 499 × 79? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  5. 5.Round 7216 to the nearest hundred.
  6. 6.Which is closest to 697 × 71? (Round each number first.) (a) 49000 (b) 490000 (c) 98000 (d) 4900
  7. 7.Round 43.69 to one decimal place. =
  8. 8.Which is closest to 897 + 697 + 602? (a) 2100 (b) 2400 (c) 2300 (d) 2200
  9. 9.Which is closest to 2405 ÷ 39? (a) 120 (b) 30 (c) 600 (d) 60
  10. 10.Round 21242 to the nearest thousand.
  11. 11.Round 40.56 to one decimal place. =
  12. 12.Which is closest to 800 × 71? (Round each number first.) (a) 560000 (b) 5600 (c) 112000 (d) 56000
  13. 13.Round 25.68 to one decimal place. =
  14. 14.Round 38.69 to one decimal place. =
  15. 15.Which is closest to 699 × 41? (Round each number first.) (a) 28000 (b) 280000 (c) 2800 (d) 56000
  16. 16.Round 2121 to the nearest ten.
  17. 17.Which is closest to 901 + 600 + 397? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  18. 18.Which is closest to 797 × 79? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
  19. 19.Round 87.58 to one decimal place. =
  20. 20.Which is closest to 699 + 195 + 803? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  21. 21.Round 52.06 to one decimal place. =
  22. 22.Which is closest to 902 × 61? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  23. 23.Round 89216 to the nearest hundred.
  24. 24.Which is closest to 1192 ÷ 39? (a) 60 (b) 30 (c) 300 (d) 15
  25. 25.Round 2095 to the nearest thousand.
  26. 26.Round 55.07 to one decimal place. =
  27. 27.Round 91516 to the nearest ten.
  28. 28.Which is closest to 995 ÷ 51? (a) 40 (b) 200 (c) 10 (d) 20
  29. 29.Which is closest to 1004 ÷ 49? (a) 200 (b) 20 (c) 10 (d) 40
  30. 30.Which is closest to 201 × 18? (Round each number first.) (a) 4000 (b) 40000 (c) 8000 (d) 400
  31. 31.Round 41373 to the nearest ten.
  32. 32.Round 26.12 to one decimal place. =
  33. 33.Which is closest to 4008 ÷ 51? (a) 800 (b) 80 (c) 160 (d) 40
  34. 34.Which is closest to 2392 ÷ 39? (a) 60 (b) 600 (c) 30 (d) 120
  35. 35.Round 42420 to the nearest hundred.
  36. 36.Which is closest to 1794 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120
  37. 37.Round 25856 to the nearest hundred.
  38. 38.Round 91964 to the nearest ten.
  39. 39.Which is closest to 197 + 795 + 495? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  40. 40.Which is closest to 1499 ÷ 31? (a) 50 (b) 500 (c) 25 (d) 100

Answer key

  1. 53000
  2. 47.5
  3. 32.4
  4. 40000
  5. 7200
  6. 49000
  7. 43.7
  8. 2200
  9. 60
  10. 21000
  11. 40.6
  12. 56000
  13. 25.7
  14. 38.7
  15. 28000
  16. 2120
  17. 1900
  18. 64000
  19. 87.6
  20. 1700
  21. 52.1
  22. 54000
  23. 89200
  24. 30
  25. 2000
  26. 55.1
  27. 91520
  28. 20
  29. 20
  30. 4000
  31. 41370
  32. 26.1
  33. 80
  34. 60
  35. 42400
  36. 60
  37. 25900
  38. 91960
  39. 1500
  40. 50

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