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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 54 · 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 15.28 to one decimal place. =
  2. 2.Which is closest to 601 + 102 + 597? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  3. 3.Which is closest to 204 + 97 + 601? (a) 1000 (b) 900 (c) 800 (d) 1100
  4. 4.Round 63.11 to one decimal place. =
  5. 5.Which is closest to 703 × 58? (Round each number first.) (a) 4200 (b) 84000 (c) 420000 (d) 42000
  6. 6.Which is closest to 397 ÷ 19? (a) 10 (b) 40 (c) 200 (d) 20
  7. 7.Which is closest to 197 × 32? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  8. 8.Which is closest to 198 × 29? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  9. 9.Round 93302 to the nearest ten.
  10. 10.Round 39962 to the nearest thousand.
  11. 11.Which is closest to 1394 ÷ 19? (a) 140 (b) 700 (c) 70 (d) 35
  12. 12.Which is closest to 595 ÷ 21? (a) 300 (b) 60 (c) 15 (d) 30
  13. 13.Round 46247 to the nearest hundred.
  14. 14.Round 63028 to the nearest ten.
  15. 15.Which is closest to 596 × 19? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  16. 16.Round 46.47 to one decimal place. =
  17. 17.Which is closest to 502 + 205 + 199? (a) 800 (b) 900 (c) 1000 (d) 1100
  18. 18.Which is closest to 601 ÷ 31? (a) 10 (b) 20 (c) 40 (d) 200
  19. 19.Round 19344 to the nearest hundred.
  20. 20.Round 96.22 to one decimal place. =
  21. 21.Which is closest to 609 ÷ 31? (a) 10 (b) 20 (c) 200 (d) 40
  22. 22.Which is closest to 900 × 82? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  23. 23.Round 53.14 to one decimal place. =
  24. 24.Which is closest to 994 ÷ 21? (a) 500 (b) 50 (c) 25 (d) 100
  25. 25.Which is closest to 994 ÷ 51? (a) 10 (b) 20 (c) 200 (d) 40
  26. 26.Round 99.66 to one decimal place. =
  27. 27.Round 81.07 to one decimal place. =
  28. 28.Which is closest to 296 × 59? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  29. 29.Which is closest to 1400 ÷ 19? (a) 140 (b) 70 (c) 35 (d) 700
  30. 30.Round 79034 to the nearest ten.
  31. 31.Round 93.77 to one decimal place. =
  32. 32.Which is closest to 599 ÷ 21? (a) 15 (b) 300 (c) 60 (d) 30
  33. 33.Round 92.92 to one decimal place. =
  34. 34.Round 80.76 to one decimal place. =
  35. 35.Which is closest to 896 + 498 + 403? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  36. 36.Which is closest to 797 × 48? (Round each number first.) (a) 4000 (b) 80000 (c) 400000 (d) 40000
  37. 37.Round 79.33 to one decimal place. =
  38. 38.Round 48412 to the nearest hundred.
  39. 39.Round 55998 to the nearest ten.
  40. 40.Which is closest to 399 + 800 + 297? (a) 1400 (b) 1700 (c) 1500 (d) 1600

Answer key

  1. 15.3
  2. 1300
  3. 900
  4. 63.1
  5. 42000
  6. 20
  7. 6000
  8. 6000
  9. 93300
  10. 40000
  11. 70
  12. 30
  13. 46200
  14. 63030
  15. 12000
  16. 46.5
  17. 900
  18. 20
  19. 19300
  20. 96.2
  21. 20
  22. 72000
  23. 53.1
  24. 50
  25. 20
  26. 99.7
  27. 81.1
  28. 18000
  29. 70
  30. 79030
  31. 93.8
  32. 30
  33. 92.9
  34. 80.8
  35. 1800
  36. 40000
  37. 79.3
  38. 48400
  39. 56000
  40. 1500

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