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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 167 · 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 300 × 28? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
  2. 2.Round 24.28 to one decimal place. =
  3. 3.Which is closest to 299 × 38? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  4. 4.Which is closest to 2406 ÷ 31? (a) 160 (b) 40 (c) 80 (d) 800
  5. 5.Which is closest to 1401 ÷ 21? (a) 700 (b) 70 (c) 140 (d) 35
  6. 6.Which is closest to 298 + 801 + 900? (a) 2200 (b) 2000 (c) 2100 (d) 1900
  7. 7.Which is closest to 605 + 304 + 200? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  8. 8.Which is closest to 400 × 88? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  9. 9.Which is closest to 2003 ÷ 41? (a) 25 (b) 50 (c) 100 (d) 500
  10. 10.Which is closest to 601 ÷ 21? (a) 300 (b) 60 (c) 15 (d) 30
  11. 11.Round 53816 to the nearest ten.
  12. 12.Round 69585 to the nearest hundred.
  13. 13.Which is closest to 300 + 899 + 396? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  14. 14.Which is closest to 3502 ÷ 51? (a) 700 (b) 140 (c) 35 (d) 70
  15. 15.Round 39964 to the nearest hundred.
  16. 16.Which is closest to 100 + 195 + 800? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  17. 17.Which is closest to 2395 ÷ 29? (a) 40 (b) 160 (c) 80 (d) 800
  18. 18.Which is closest to 609 ÷ 21? (a) 300 (b) 60 (c) 15 (d) 30
  19. 19.Which is closest to 795 ÷ 21? (a) 20 (b) 400 (c) 40 (d) 80
  20. 20.Which is closest to 598 × 51? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  21. 21.Which is closest to 196 + 201 + 600? (a) 1100 (b) 1200 (c) 900 (d) 1000
  22. 22.Which is closest to 596 + 897 + 298? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  23. 23.Round 65.88 to one decimal place. =
  24. 24.Round 28.07 to one decimal place. =
  25. 25.Round 80167 to the nearest thousand.
  26. 26.Which is closest to 1198 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  27. 27.Which is closest to 1598 ÷ 39? (a) 400 (b) 40 (c) 80 (d) 20
  28. 28.Which is closest to 198 × 82? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  29. 29.Round 41091 to the nearest hundred.
  30. 30.Round 80937 to the nearest ten.
  31. 31.Which is closest to 701 × 42? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  32. 32.Which is closest to 1207 ÷ 39? (a) 60 (b) 30 (c) 300 (d) 15
  33. 33.Which is closest to 603 × 52? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  34. 34.Which is closest to 299 + 400 + 202? (a) 1000 (b) 800 (c) 900 (d) 1100
  35. 35.Which is closest to 305 + 905 + 802? (a) 2000 (b) 1900 (c) 2100 (d) 2200
  36. 36.Which is closest to 696 + 697 + 299? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  37. 37.Round 61.18 to one decimal place. =
  38. 38.Which is closest to 504 × 21? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  39. 39.Round 28884 to the nearest hundred.
  40. 40.Round 49039 to the nearest ten.

Answer key

  1. 9000
  2. 24.3
  3. 12000
  4. 80
  5. 70
  6. 2000
  7. 1100
  8. 36000
  9. 50
  10. 30
  11. 53820
  12. 69600
  13. 1600
  14. 70
  15. 40000
  16. 1100
  17. 80
  18. 30
  19. 40
  20. 30000
  21. 1000
  22. 1800
  23. 65.9
  24. 28.1
  25. 80000
  26. 60
  27. 40
  28. 16000
  29. 41100
  30. 80940
  31. 28000
  32. 30
  33. 30000
  34. 900
  35. 2000
  36. 1700
  37. 61.2
  38. 10000
  39. 28900
  40. 49040

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