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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 895 · 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 72360 to the nearest thousand.
  2. 2.Which is closest to 803 × 31? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  3. 3.Which is closest to 696 + 395 + 497? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  4. 4.Round 77052 to the nearest thousand.
  5. 5.Which is closest to 799 × 72? (Round each number first.) (a) 560000 (b) 5600 (c) 112000 (d) 56000
  6. 6.Which is closest to 105 + 604 + 203? (a) 1100 (b) 800 (c) 1000 (d) 900
  7. 7.Which is closest to 4002 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  8. 8.Which is closest to 604 + 198 + 505? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  9. 9.Which is closest to 502 + 305 + 200? (a) 900 (b) 1100 (c) 1000 (d) 1200
  10. 10.Round 93.94 to one decimal place. =
  11. 11.Which is closest to 808 ÷ 41? (a) 20 (b) 40 (c) 10 (d) 200
  12. 12.Round 46526 to the nearest ten.
  13. 13.Round 25914 to the nearest ten.
  14. 14.Round 23.69 to one decimal place. =
  15. 15.Which is closest to 2798 ÷ 39? (a) 35 (b) 70 (c) 140 (d) 700
  16. 16.Which is closest to 601 × 50? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  17. 17.Round 9745 to the nearest thousand.
  18. 18.Round 83.66 to one decimal place. =
  19. 19.Round 77.48 to one decimal place. =
  20. 20.Which is closest to 597 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  21. 21.Which is closest to 902 × 72? (Round each number first.) (a) 630000 (b) 126000 (c) 63000 (d) 6300
  22. 22.Round 38.19 to one decimal place. =
  23. 23.Which is closest to 2391 ÷ 29? (a) 800 (b) 40 (c) 160 (d) 80
  24. 24.Round 2461 to the nearest ten.
  25. 25.Which is closest to 1209 ÷ 41? (a) 60 (b) 30 (c) 300 (d) 15
  26. 26.Round 29.63 to one decimal place. =
  27. 27.Round 18.56 to one decimal place. =
  28. 28.Round 33612 to the nearest hundred.
  29. 29.Which is closest to 702 × 91? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000
  30. 30.Which is closest to 202 × 61? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  31. 31.Round 29960 to the nearest thousand.
  32. 32.Which is closest to 203 × 19? (Round each number first.) (a) 40000 (b) 400 (c) 4000 (d) 8000
  33. 33.Which is closest to 702 × 62? (Round each number first.) (a) 420000 (b) 84000 (c) 4200 (d) 42000
  34. 34.Round 42425 to the nearest thousand.
  35. 35.Round 64380 to the nearest hundred.
  36. 36.Which is closest to 2000 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  37. 37.Round 38.34 to one decimal place. =
  38. 38.Round 44.93 to one decimal place. =
  39. 39.Round 47915 to the nearest thousand.
  40. 40.Which is closest to 1597 ÷ 19? (a) 800 (b) 40 (c) 160 (d) 80

Answer key

  1. 72000
  2. 24000
  3. 1600
  4. 77000
  5. 56000
  6. 900
  7. 80
  8. 1300
  9. 1000
  10. 93.9
  11. 20
  12. 46530
  13. 25910
  14. 23.7
  15. 70
  16. 30000
  17. 10000
  18. 83.7
  19. 77.5
  20. 30
  21. 63000
  22. 38.2
  23. 80
  24. 2460
  25. 30
  26. 29.6
  27. 18.6
  28. 33600
  29. 63000
  30. 12000
  31. 30000
  32. 4000
  33. 42000
  34. 42000
  35. 64400
  36. 50
  37. 38.3
  38. 44.9
  39. 48000
  40. 80

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