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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 195 · 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 899 × 49? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  2. 2.Round 23.93 to one decimal place. =
  3. 3.Which is closest to 200 × 72? (Round each number first.) (a) 14000 (b) 28000 (c) 140000 (d) 1400
  4. 4.Round 52.73 to one decimal place. =
  5. 5.Which is closest to 801 + 196 + 695? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  6. 6.Round 80842 to the nearest thousand.
  7. 7.Which is closest to 697 × 79? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  8. 8.Which is closest to 296 × 88? (Round each number first.) (a) 2700 (b) 54000 (c) 27000 (d) 270000
  9. 9.Which is closest to 601 ÷ 19? (a) 30 (b) 60 (c) 300 (d) 15
  10. 10.Which is closest to 803 × 32? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  11. 11.Which is closest to 2103 ÷ 31? (a) 35 (b) 700 (c) 70 (d) 140
  12. 12.Which is closest to 603 ÷ 19? (a) 60 (b) 300 (c) 30 (d) 15
  13. 13.Which is closest to 897 + 295 + 796? (a) 2100 (b) 2200 (c) 2000 (d) 1900
  14. 14.Which is closest to 699 × 40? (Round each number first.) (a) 28000 (b) 280000 (c) 2800 (d) 56000
  15. 15.Round 41356 to the nearest hundred.
  16. 16.Which is closest to 2396 ÷ 29? (a) 160 (b) 40 (c) 800 (d) 80
  17. 17.Which is closest to 196 × 32? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  18. 18.Which is closest to 897 × 58? (Round each number first.) (a) 108000 (b) 540000 (c) 54000 (d) 5400
  19. 19.Which is closest to 404 + 497 + 595? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  20. 20.Round 36671 to the nearest thousand.
  21. 21.Round 40.21 to one decimal place. =
  22. 22.Which is closest to 2991 ÷ 51? (a) 30 (b) 60 (c) 120 (d) 600
  23. 23.Which is closest to 497 + 195 + 704? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  24. 24.Round 26.56 to one decimal place. =
  25. 25.Which is closest to 797 + 703 + 896? (a) 2300 (b) 2400 (c) 2600 (d) 2500
  26. 26.Round 59451 to the nearest ten.
  27. 27.Round 56740 to the nearest hundred.
  28. 28.Which is closest to 498 + 205 + 903? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  29. 29.Round 95.47 to one decimal place. =
  30. 30.Round 84.74 to one decimal place. =
  31. 31.Which is closest to 899 ÷ 29? (a) 300 (b) 15 (c) 60 (d) 30
  32. 32.Which is closest to 200 × 88? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  33. 33.Which is closest to 895 + 503 + 897? (a) 2500 (b) 2200 (c) 2300 (d) 2400
  34. 34.Round 30.07 to one decimal place. =
  35. 35.Round 78.43 to one decimal place. =
  36. 36.Round 15.24 to one decimal place. =
  37. 37.Which is closest to 198 + 295 + 504? (a) 900 (b) 1200 (c) 1100 (d) 1000
  38. 38.Which is closest to 598 + 802 + 104? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  39. 39.Round 89971 to the nearest hundred.
  40. 40.Round 44.42 to one decimal place. =

Answer key

  1. 45000
  2. 23.9
  3. 14000
  4. 52.7
  5. 1700
  6. 81000
  7. 56000
  8. 27000
  9. 30
  10. 24000
  11. 70
  12. 30
  13. 2000
  14. 28000
  15. 41400
  16. 80
  17. 6000
  18. 54000
  19. 1500
  20. 37000
  21. 40.2
  22. 60
  23. 1400
  24. 26.6
  25. 2400
  26. 59450
  27. 56700
  28. 1600
  29. 95.5
  30. 84.7
  31. 30
  32. 18000
  33. 2300
  34. 30.1
  35. 78.4
  36. 15.2
  37. 1000
  38. 1500
  39. 90000
  40. 44.4

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