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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 22 · 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 201 × 58? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  2. 2.Which is closest to 900 + 403 + 198? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  3. 3.Round 68040 to the nearest thousand.
  4. 4.Which is closest to 504 × 20? (Round each number first.) (a) 1000 (b) 10000 (c) 20000 (d) 100000
  5. 5.Which is closest to 96 + 197 + 303? (a) 700 (b) 800 (c) 600 (d) 500
  6. 6.Round 6942 to the nearest ten.
  7. 7.Round 51.63 to one decimal place. =
  8. 8.Which is closest to 304 + 799 + 704? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  9. 9.Round 26.33 to one decimal place. =
  10. 10.Round 17.82 to one decimal place. =
  11. 11.Which is closest to 1192 ÷ 41? (a) 300 (b) 30 (c) 60 (d) 15
  12. 12.Round 43413 to the nearest hundred.
  13. 13.Which is closest to 897 × 32? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  14. 14.Round 90.18 to one decimal place. =
  15. 15.Which is closest to 703 + 698 + 201? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  16. 16.Which is closest to 1798 ÷ 29? (a) 30 (b) 60 (c) 120 (d) 600
  17. 17.Which is closest to 700 × 89? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000
  18. 18.Which is closest to 201 × 88? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  19. 19.Which is closest to 900 × 91? (Round each number first.) (a) 162000 (b) 8100 (c) 81000 (d) 810000
  20. 20.Which is closest to 301 × 41? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  21. 21.Which is closest to 904 × 40? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
  22. 22.Round 33.23 to one decimal place. =
  23. 23.Which is closest to 397 × 39? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  24. 24.Which is closest to 304 + 897 + 296? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  25. 25.Which is closest to 804 × 80? (Round each number first.) (a) 128000 (b) 64000 (c) 6400 (d) 640000
  26. 26.Which is closest to 102 + 796 + 605? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  27. 27.Which is closest to 98 + 803 + 198? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  28. 28.Round 91.51 to one decimal place. =
  29. 29.Round 17.64 to one decimal place. =
  30. 30.Which is closest to 297 × 69? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  31. 31.Round 70114 to the nearest thousand.
  32. 32.Which is closest to 909 ÷ 31? (a) 300 (b) 60 (c) 15 (d) 30
  33. 33.Which is closest to 1597 ÷ 39? (a) 80 (b) 20 (c) 40 (d) 400
  34. 34.Round 64.94 to one decimal place. =
  35. 35.Round 68055 to the nearest hundred.
  36. 36.Which is closest to 803 × 41? (Round each number first.) (a) 32000 (b) 320000 (c) 3200 (d) 64000
  37. 37.Round 84.17 to one decimal place. =
  38. 38.Round 38549 to the nearest thousand.
  39. 39.Round 46.23 to one decimal place. =
  40. 40.Round 43012 to the nearest ten.

Answer key

  1. 12000
  2. 1500
  3. 68000
  4. 10000
  5. 600
  6. 6940
  7. 51.6
  8. 1800
  9. 26.3
  10. 17.8
  11. 30
  12. 43400
  13. 27000
  14. 90.2
  15. 1600
  16. 60
  17. 63000
  18. 18000
  19. 81000
  20. 12000
  21. 36000
  22. 33.2
  23. 16000
  24. 1500
  25. 64000
  26. 1500
  27. 1100
  28. 91.5
  29. 17.6
  30. 21000
  31. 70000
  32. 30
  33. 40
  34. 64.9
  35. 68100
  36. 32000
  37. 84.2
  38. 39000
  39. 46.2
  40. 43010

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