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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 272 · 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 37951 to the nearest ten.
  2. 2.Round 21.09 to one decimal place. =
  3. 3.Round 97922 to the nearest ten.
  4. 4.Round 35689 to the nearest thousand.
  5. 5.Round 96697 to the nearest ten.
  6. 6.Which is closest to 104 + 902 + 698? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  7. 7.Which is closest to 392 ÷ 21? (a) 10 (b) 200 (c) 40 (d) 20
  8. 8.Which is closest to 800 + 296 + 799? (a) 2100 (b) 1900 (c) 1800 (d) 2000
  9. 9.Which is closest to 698 × 49? (Round each number first.) (a) 35000 (b) 3500 (c) 350000 (d) 70000
  10. 10.Which is closest to 696 × 48? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  11. 11.Round 87.69 to one decimal place. =
  12. 12.Which is closest to 796 + 105 + 805? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  13. 13.Round 5697 to the nearest thousand.
  14. 14.Which is closest to 296 × 50? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
  15. 15.Round 54.22 to one decimal place. =
  16. 16.Which is closest to 2803 ÷ 41? (a) 700 (b) 70 (c) 35 (d) 140
  17. 17.Which is closest to 902 × 49? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
  18. 18.Which is closest to 897 × 72? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  19. 19.Round 43.64 to one decimal place. =
  20. 20.Which is closest to 1506 ÷ 31? (a) 25 (b) 50 (c) 500 (d) 100
  21. 21.Which is closest to 95 + 896 + 298? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  22. 22.Round 36.51 to one decimal place. =
  23. 23.Which is closest to 598 ÷ 21? (a) 300 (b) 15 (c) 60 (d) 30
  24. 24.Which is closest to 101 + 296 + 799? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  25. 25.Which is closest to 304 + 300 + 499? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  26. 26.Round 95804 to the nearest ten.
  27. 27.Round 57.26 to one decimal place. =
  28. 28.Which is closest to 203 × 79? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  29. 29.Which is closest to 301 × 42? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  30. 30.Which is closest to 1609 ÷ 41? (a) 400 (b) 80 (c) 40 (d) 20
  31. 31.Which is closest to 995 ÷ 19? (a) 100 (b) 500 (c) 25 (d) 50
  32. 32.Round 76.27 to one decimal place. =
  33. 33.Round 33811 to the nearest thousand.
  34. 34.Round 77439 to the nearest thousand.
  35. 35.Which is closest to 205 + 901 + 205? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  36. 36.Which is closest to 396 × 91? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  37. 37.Round 9564 to the nearest ten.
  38. 38.Which is closest to 901 × 42? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  39. 39.Which is closest to 603 × 20? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  40. 40.Round 11.77 to one decimal place. =

Answer key

  1. 37950
  2. 21.1
  3. 97920
  4. 36000
  5. 96700
  6. 1700
  7. 20
  8. 1900
  9. 35000
  10. 35000
  11. 87.7
  12. 1700
  13. 6000
  14. 15000
  15. 54.2
  16. 70
  17. 45000
  18. 63000
  19. 43.6
  20. 50
  21. 1300
  22. 36.5
  23. 30
  24. 1200
  25. 1100
  26. 95800
  27. 57.3
  28. 16000
  29. 12000
  30. 40
  31. 50
  32. 76.3
  33. 34000
  34. 77000
  35. 1300
  36. 36000
  37. 9560
  38. 36000
  39. 12000
  40. 11.8

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