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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 913 · 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 21143 to the nearest hundred.
  2. 2.Round 33587 to the nearest hundred.
  3. 3.Which is closest to 497 × 22? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
  4. 4.Round 62.71 to one decimal place. =
  5. 5.Round 72758 to the nearest thousand.
  6. 6.Round 3558 to the nearest thousand.
  7. 7.Which is closest to 697 × 28? (Round each number first.) (a) 2100 (b) 21000 (c) 210000 (d) 42000
  8. 8.Which is closest to 199 × 30? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  9. 9.Which is closest to 298 × 92? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  10. 10.Which is closest to 1194 ÷ 29? (a) 400 (b) 40 (c) 80 (d) 20
  11. 11.Which is closest to 1806 ÷ 29? (a) 600 (b) 30 (c) 60 (d) 120
  12. 12.Which is closest to 398 × 89? (Round each number first.) (a) 360000 (b) 36000 (c) 3600 (d) 72000
  13. 13.Round 20257 to the nearest hundred.
  14. 14.Which is closest to 895 ÷ 29? (a) 60 (b) 30 (c) 15 (d) 300
  15. 15.Which is closest to 904 + 697 + 903? (a) 2500 (b) 2700 (c) 2400 (d) 2600
  16. 16.Round 25.57 to one decimal place. =
  17. 17.Round 67.41 to one decimal place. =
  18. 18.Which is closest to 195 + 504 + 300? (a) 1100 (b) 1000 (c) 1200 (d) 900
  19. 19.Which is closest to 396 + 805 + 499? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  20. 20.Which is closest to 601 × 49? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
  21. 21.Round 51022 to the nearest thousand.
  22. 22.Round 72.76 to one decimal place. =
  23. 23.Which is closest to 994 ÷ 49? (a) 200 (b) 40 (c) 20 (d) 10
  24. 24.Round 24761 to the nearest hundred.
  25. 25.Round 21189 to the nearest ten.
  26. 26.Round 41183 to the nearest ten.
  27. 27.Round 74063 to the nearest thousand.
  28. 28.Round 44042 to the nearest ten.
  29. 29.Which is closest to 1509 ÷ 31? (a) 25 (b) 100 (c) 50 (d) 500
  30. 30.Round 39279 to the nearest ten.
  31. 31.Which is closest to 197 × 49? (Round each number first.) (a) 10000 (b) 1000 (c) 20000 (d) 100000
  32. 32.Which is closest to 2405 ÷ 29? (a) 80 (b) 40 (c) 160 (d) 800
  33. 33.Round 85.34 to one decimal place. =
  34. 34.Round 17.69 to one decimal place. =
  35. 35.Which is closest to 1204 ÷ 31? (a) 20 (b) 400 (c) 80 (d) 40
  36. 36.Which is closest to 897 + 903 + 799? (a) 2800 (b) 2600 (c) 2500 (d) 2700
  37. 37.Which is closest to 399 × 78? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  38. 38.Which is closest to 602 + 496 + 900? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  39. 39.Which is closest to 795 + 703 + 200? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  40. 40.Which is closest to 3599 ÷ 41? (a) 90 (b) 180 (c) 900 (d) 45

Answer key

  1. 21100
  2. 33600
  3. 10000
  4. 62.7
  5. 73000
  6. 4000
  7. 21000
  8. 6000
  9. 27000
  10. 40
  11. 60
  12. 36000
  13. 20300
  14. 30
  15. 2500
  16. 25.6
  17. 67.4
  18. 1000
  19. 1700
  20. 30000
  21. 51000
  22. 72.8
  23. 20
  24. 24800
  25. 21190
  26. 41180
  27. 74000
  28. 44040
  29. 50
  30. 39280
  31. 10000
  32. 80
  33. 85.3
  34. 17.7
  35. 40
  36. 2600
  37. 32000
  38. 2000
  39. 1700
  40. 90

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