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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 276 · 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 601 ÷ 19? (a) 30 (b) 300 (c) 15 (d) 60
  2. 2.Round 22.79 to one decimal place. =
  3. 3.Round 12.09 to one decimal place. =
  4. 4.Round 77871 to the nearest thousand.
  5. 5.Which is closest to 201 + 202 + 203? (a) 800 (b) 700 (c) 600 (d) 500
  6. 6.Round 34.81 to one decimal place. =
  7. 7.Round 97885 to the nearest hundred.
  8. 8.Round 94.11 to one decimal place. =
  9. 9.Which is closest to 202 × 92? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  10. 10.Which is closest to 300 × 88? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  11. 11.Round 66572 to the nearest thousand.
  12. 12.Round 50298 to the nearest hundred.
  13. 13.Which is closest to 1206 ÷ 29? (a) 400 (b) 80 (c) 20 (d) 40
  14. 14.Round 73.56 to one decimal place. =
  15. 15.Which is closest to 96 + 895 + 197? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  16. 16.Which is closest to 801 × 49? (Round each number first.) (a) 40000 (b) 400000 (c) 4000 (d) 80000
  17. 17.Round 28585 to the nearest hundred.
  18. 18.Round 23204 to the nearest thousand.
  19. 19.Round 42.11 to one decimal place. =
  20. 20.Which is closest to 903 × 21? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  21. 21.Which is closest to 895 + 101 + 302? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  22. 22.Round 61.22 to one decimal place. =
  23. 23.Which is closest to 605 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  24. 24.Which is closest to 1195 ÷ 41? (a) 60 (b) 15 (c) 30 (d) 300
  25. 25.Which is closest to 3991 ÷ 51? (a) 40 (b) 80 (c) 800 (d) 160
  26. 26.Which is closest to 2995 ÷ 49? (a) 600 (b) 60 (c) 30 (d) 120
  27. 27.Which is closest to 598 + 799 + 104? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  28. 28.Which is closest to 903 × 82? (Round each number first.) (a) 72000 (b) 144000 (c) 7200 (d) 720000
  29. 29.Round 19.37 to one decimal place. =
  30. 30.Round 26604 to the nearest ten.
  31. 31.Which is closest to 400 × 58? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  32. 32.Which is closest to 896 + 200 + 795? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  33. 33.Round 26603 to the nearest thousand.
  34. 34.Which is closest to 504 × 71? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000
  35. 35.Round 86.44 to one decimal place. =
  36. 36.Round 65.54 to one decimal place. =
  37. 37.Which is closest to 399 + 605 + 897? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  38. 38.Round 16650 to the nearest thousand.
  39. 39.Round 20.82 to one decimal place. =
  40. 40.Which is closest to 801 × 41? (Round each number first.) (a) 320000 (b) 64000 (c) 3200 (d) 32000

Answer key

  1. 30
  2. 22.8
  3. 12.1
  4. 78000
  5. 600
  6. 34.8
  7. 97900
  8. 94.1
  9. 18000
  10. 27000
  11. 67000
  12. 50300
  13. 40
  14. 73.6
  15. 1200
  16. 40000
  17. 28600
  18. 23000
  19. 42.1
  20. 18000
  21. 1300
  22. 61.2
  23. 20
  24. 30
  25. 80
  26. 60
  27. 1500
  28. 72000
  29. 19.4
  30. 26600
  31. 24000
  32. 1900
  33. 27000
  34. 35000
  35. 86.4
  36. 65.5
  37. 1900
  38. 17000
  39. 20.8
  40. 32000

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