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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 570 · 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 27488 to the nearest thousand.
  2. 2.Which is closest to 901 ÷ 29? (a) 30 (b) 60 (c) 15 (d) 300
  3. 3.Which is closest to 801 ÷ 39? (a) 200 (b) 10 (c) 20 (d) 40
  4. 4.Round 35.92 to one decimal place. =
  5. 5.Which is closest to 1797 ÷ 19? (a) 180 (b) 45 (c) 900 (d) 90
  6. 6.Which is closest to 902 + 698 + 95? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  7. 7.Round 95.73 to one decimal place. =
  8. 8.Which is closest to 2996 ÷ 51? (a) 30 (b) 60 (c) 120 (d) 600
  9. 9.Round 55520 to the nearest hundred.
  10. 10.Round 89.26 to one decimal place. =
  11. 11.Which is closest to 405 + 604 + 198? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  12. 12.Which is closest to 202 × 48? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
  13. 13.Which is closest to 505 + 300 + 199? (a) 1000 (b) 1200 (c) 1100 (d) 900
  14. 14.Which is closest to 900 + 296 + 100? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  15. 15.Round 33522 to the nearest hundred.
  16. 16.Which is closest to 696 + 96 + 302? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  17. 17.Round 18.39 to one decimal place. =
  18. 18.Which is closest to 400 + 595 + 499? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  19. 19.Which is closest to 796 × 58? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  20. 20.Round 19256 to the nearest thousand.
  21. 21.Round 63.19 to one decimal place. =
  22. 22.Round 75.24 to one decimal place. =
  23. 23.Round 89810 to the nearest thousand.
  24. 24.Which is closest to 1200 ÷ 31? (a) 40 (b) 400 (c) 80 (d) 20
  25. 25.Round 92.32 to one decimal place. =
  26. 26.Which is closest to 903 + 98 + 303? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  27. 27.Which is closest to 204 × 39? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  28. 28.Round 32.94 to one decimal place. =
  29. 29.Which is closest to 302 × 89? (Round each number first.) (a) 2700 (b) 54000 (c) 27000 (d) 270000
  30. 30.Round 65.12 to one decimal place. =
  31. 31.Which is closest to 204 × 20? (Round each number first.) (a) 4000 (b) 40000 (c) 8000 (d) 400
  32. 32.Which is closest to 1809 ÷ 31? (a) 60 (b) 600 (c) 30 (d) 120
  33. 33.Which is closest to 202 × 59? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  34. 34.Which is closest to 295 + 697 + 505? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  35. 35.Which is closest to 299 × 42? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  36. 36.Which is closest to 698 + 599 + 695? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  37. 37.Which is closest to 901 × 92? (Round each number first.) (a) 162000 (b) 810000 (c) 81000 (d) 8100
  38. 38.Which is closest to 2107 ÷ 31? (a) 35 (b) 140 (c) 70 (d) 700
  39. 39.Round 45474 to the nearest ten.
  40. 40.Round 61450 to the nearest thousand.

Answer key

  1. 27000
  2. 30
  3. 20
  4. 35.9
  5. 90
  6. 1700
  7. 95.7
  8. 60
  9. 55500
  10. 89.3
  11. 1200
  12. 10000
  13. 1000
  14. 1300
  15. 33500
  16. 1100
  17. 18.4
  18. 1500
  19. 48000
  20. 19000
  21. 63.2
  22. 75.2
  23. 90000
  24. 40
  25. 92.3
  26. 1300
  27. 8000
  28. 32.9
  29. 27000
  30. 65.1
  31. 4000
  32. 60
  33. 12000
  34. 1500
  35. 12000
  36. 2000
  37. 81000
  38. 70
  39. 45470
  40. 61000

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