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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 612 · 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 900 × 38? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  2. 2.Which is closest to 896 × 60? (Round each number first.) (a) 54000 (b) 5400 (c) 540000 (d) 108000
  3. 3.Round 73.21 to one decimal place. =
  4. 4.Which is closest to 407 ÷ 19? (a) 200 (b) 40 (c) 10 (d) 20
  5. 5.Round 20.54 to one decimal place. =
  6. 6.Round 36.19 to one decimal place. =
  7. 7.Which is closest to 892 ÷ 31? (a) 30 (b) 60 (c) 300 (d) 15
  8. 8.Round 22885 to the nearest hundred.
  9. 9.Which is closest to 795 + 896 + 703? (a) 2600 (b) 2300 (c) 2500 (d) 2400
  10. 10.Round 65.68 to one decimal place. =
  11. 11.Which is closest to 403 × 62? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  12. 12.Which is closest to 601 × 50? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  13. 13.Round 37338 to the nearest hundred.
  14. 14.Which is closest to 901 × 59? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  15. 15.Which is closest to 1001 ÷ 21? (a) 500 (b) 25 (c) 50 (d) 100
  16. 16.Which is closest to 205 + 704 + 699? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  17. 17.Which is closest to 600 + 495 + 803? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  18. 18.Which is closest to 604 × 72? (Round each number first.) (a) 4200 (b) 420000 (c) 84000 (d) 42000
  19. 19.Which is closest to 899 ÷ 29? (a) 15 (b) 60 (c) 300 (d) 30
  20. 20.Which is closest to 496 + 95 + 403? (a) 1200 (b) 1000 (c) 900 (d) 1100
  21. 21.Round 54.07 to one decimal place. =
  22. 22.Which is closest to 805 + 699 + 295? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  23. 23.Round 97.26 to one decimal place. =
  24. 24.Which is closest to 1206 ÷ 19? (a) 30 (b) 600 (c) 120 (d) 60
  25. 25.Which is closest to 996 ÷ 21? (a) 500 (b) 25 (c) 50 (d) 100
  26. 26.Which is closest to 96 + 702 + 904? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  27. 27.Which is closest to 702 × 51? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  28. 28.Which is closest to 3607 ÷ 39? (a) 900 (b) 45 (c) 180 (d) 90
  29. 29.Round 34.28 to one decimal place. =
  30. 30.Which is closest to 595 + 799 + 901? (a) 2500 (b) 2400 (c) 2300 (d) 2200
  31. 31.Round 42526 to the nearest hundred.
  32. 32.Which is closest to 1404 ÷ 21? (a) 70 (b) 700 (c) 35 (d) 140
  33. 33.Which is closest to 197 × 68? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  34. 34.Round 28.11 to one decimal place. =
  35. 35.Round 24.06 to one decimal place. =
  36. 36.Round 76574 to the nearest ten.
  37. 37.Which is closest to 197 + 596 + 203? (a) 1200 (b) 1100 (c) 1000 (d) 900
  38. 38.Round 80578 to the nearest ten.
  39. 39.Round 63.41 to one decimal place. =
  40. 40.Which is closest to 598 × 68? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000

Answer key

  1. 36000
  2. 54000
  3. 73.2
  4. 20
  5. 20.5
  6. 36.2
  7. 30
  8. 22900
  9. 2400
  10. 65.7
  11. 24000
  12. 30000
  13. 37300
  14. 54000
  15. 50
  16. 1600
  17. 1900
  18. 42000
  19. 30
  20. 1000
  21. 54.1
  22. 1800
  23. 97.3
  24. 60
  25. 50
  26. 1700
  27. 35000
  28. 90
  29. 34.3
  30. 2300
  31. 42500
  32. 70
  33. 14000
  34. 28.1
  35. 24.1
  36. 76570
  37. 1000
  38. 80580
  39. 63.4
  40. 42000

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