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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 741 · 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 594 ÷ 29? (a) 40 (b) 200 (c) 20 (d) 10
  2. 2.Which is closest to 897 × 39? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  3. 3.Round 62.53 to one decimal place. =
  4. 4.Which is closest to 595 + 105 + 197? (a) 1100 (b) 800 (c) 900 (d) 1000
  5. 5.Which is closest to 400 + 502 + 302? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  6. 6.Which is closest to 200 × 29? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000
  7. 7.Round 64611 to the nearest ten.
  8. 8.Which is closest to 1598 ÷ 21? (a) 160 (b) 800 (c) 80 (d) 40
  9. 9.Which is closest to 1208 ÷ 31? (a) 80 (b) 20 (c) 40 (d) 400
  10. 10.Round 55.24 to one decimal place. =
  11. 11.Which is closest to 1607 ÷ 41? (a) 400 (b) 40 (c) 80 (d) 20
  12. 12.Which is closest to 994 ÷ 19? (a) 100 (b) 500 (c) 25 (d) 50
  13. 13.Which is closest to 3604 ÷ 41? (a) 900 (b) 90 (c) 180 (d) 45
  14. 14.Round 67.72 to one decimal place. =
  15. 15.Which is closest to 599 ÷ 31? (a) 10 (b) 200 (c) 20 (d) 40
  16. 16.Which is closest to 901 × 18? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  17. 17.Which is closest to 1601 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  18. 18.Which is closest to 401 × 68? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  19. 19.Which is closest to 104 + 505 + 597? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  20. 20.Which is closest to 199 + 299 + 302? (a) 900 (b) 1000 (c) 700 (d) 800
  21. 21.Which is closest to 204 + 798 + 301? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  22. 22.Round 82946 to the nearest thousand.
  23. 23.Which is closest to 200 × 51? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  24. 24.Round 29397 to the nearest hundred.
  25. 25.Which is closest to 1491 ÷ 51? (a) 15 (b) 60 (c) 30 (d) 300
  26. 26.Which is closest to 607 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  27. 27.Round 17.64 to one decimal place. =
  28. 28.Which is closest to 198 + 202 + 302? (a) 700 (b) 900 (c) 600 (d) 800
  29. 29.Which is closest to 298 × 51? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  30. 30.Which is closest to 1201 ÷ 29? (a) 400 (b) 20 (c) 80 (d) 40
  31. 31.Round 73.21 to one decimal place. =
  32. 32.Which is closest to 100 + 98 + 495? (a) 800 (b) 600 (c) 700 (d) 900
  33. 33.Which is closest to 2005 ÷ 39? (a) 100 (b) 50 (c) 25 (d) 500
  34. 34.Which is closest to 96 + 400 + 503? (a) 1000 (b) 1100 (c) 1200 (d) 900
  35. 35.Round 31143 to the nearest ten.
  36. 36.Round 14562 to the nearest ten.
  37. 37.Which is closest to 200 × 42? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  38. 38.Which is closest to 201 × 19? (Round each number first.) (a) 40000 (b) 400 (c) 4000 (d) 8000
  39. 39.Which is closest to 304 × 30? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  40. 40.Round 30194 to the nearest thousand.

Answer key

  1. 20
  2. 36000
  3. 62.5
  4. 900
  5. 1200
  6. 6000
  7. 64610
  8. 80
  9. 40
  10. 55.2
  11. 40
  12. 50
  13. 90
  14. 67.7
  15. 20
  16. 18000
  17. 40
  18. 28000
  19. 1200
  20. 800
  21. 1300
  22. 83000
  23. 10000
  24. 29400
  25. 30
  26. 20
  27. 17.6
  28. 700
  29. 15000
  30. 40
  31. 73.2
  32. 700
  33. 50
  34. 1000
  35. 31140
  36. 14560
  37. 8000
  38. 4000
  39. 9000
  40. 30000

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