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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 455 · 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 54.72 to one decimal place. =
  2. 2.Which is closest to 1008 ÷ 21? (a) 500 (b) 50 (c) 25 (d) 100
  3. 3.Round 35.34 to one decimal place. =
  4. 4.Which is closest to 1409 ÷ 19? (a) 35 (b) 700 (c) 70 (d) 140
  5. 5.Which is closest to 596 + 597 + 203? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  6. 6.Which is closest to 1807 ÷ 19? (a) 180 (b) 900 (c) 90 (d) 45
  7. 7.Which is closest to 1994 ÷ 49? (a) 80 (b) 400 (c) 20 (d) 40
  8. 8.Which is closest to 301 × 31? (Round each number first.) (a) 90000 (b) 900 (c) 18000 (d) 9000
  9. 9.Round 70013 to the nearest hundred.
  10. 10.Which is closest to 504 + 695 + 905? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  11. 11.Which is closest to 503 × 78? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  12. 12.Round 75422 to the nearest hundred.
  13. 13.Which is closest to 899 × 79? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  14. 14.Which is closest to 97 + 398 + 301? (a) 800 (b) 900 (c) 700 (d) 1000
  15. 15.Round 89110 to the nearest thousand.
  16. 16.Which is closest to 3994 ÷ 51? (a) 80 (b) 800 (c) 40 (d) 160
  17. 17.Which is closest to 100 + 600 + 695? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  18. 18.Which is closest to 296 × 48? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  19. 19.Which is closest to 2495 ÷ 49? (a) 100 (b) 500 (c) 25 (d) 50
  20. 20.Which is closest to 3195 ÷ 41? (a) 800 (b) 160 (c) 80 (d) 40
  21. 21.Which is closest to 800 × 92? (Round each number first.) (a) 7200 (b) 72000 (c) 144000 (d) 720000
  22. 22.Which is closest to 699 + 403 + 605? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  23. 23.Which is closest to 794 ÷ 39? (a) 200 (b) 40 (c) 20 (d) 10
  24. 24.Which is closest to 105 + 802 + 800? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  25. 25.Round 80174 to the nearest thousand.
  26. 26.Which is closest to 1601 ÷ 39? (a) 20 (b) 400 (c) 40 (d) 80
  27. 27.Which is closest to 904 + 103 + 395? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  28. 28.Which is closest to 796 + 904 + 201? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  29. 29.Round 89325 to the nearest hundred.
  30. 30.Round 23618 to the nearest thousand.
  31. 31.Round 19320 to the nearest thousand.
  32. 32.Which is closest to 505 + 303 + 95? (a) 800 (b) 1000 (c) 1100 (d) 900
  33. 33.Which is closest to 1993 ÷ 51? (a) 20 (b) 400 (c) 80 (d) 40
  34. 34.Which is closest to 903 + 799 + 197? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  35. 35.Round 24064 to the nearest thousand.
  36. 36.Round 46.12 to one decimal place. =
  37. 37.Round 19.78 to one decimal place. =
  38. 38.Which is closest to 2506 ÷ 49? (a) 25 (b) 500 (c) 50 (d) 100
  39. 39.Round 86553 to the nearest ten.
  40. 40.Round 63043 to the nearest ten.

Answer key

  1. 54.7
  2. 50
  3. 35.3
  4. 70
  5. 1400
  6. 90
  7. 40
  8. 9000
  9. 70000
  10. 2100
  11. 40000
  12. 75400
  13. 72000
  14. 800
  15. 89000
  16. 80
  17. 1400
  18. 15000
  19. 50
  20. 80
  21. 72000
  22. 1700
  23. 20
  24. 1700
  25. 80000
  26. 40
  27. 1400
  28. 1900
  29. 89300
  30. 24000
  31. 19000
  32. 900
  33. 40
  34. 1900
  35. 24000
  36. 46.1
  37. 19.8
  38. 50
  39. 86550
  40. 63040

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