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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 429 · 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 25.28 to one decimal place. =
  2. 2.Round 42407 to the nearest thousand.
  3. 3.Which is closest to 1196 ÷ 19? (a) 600 (b) 60 (c) 30 (d) 120
  4. 4.Round 43.43 to one decimal place. =
  5. 5.Round 77314 to the nearest ten.
  6. 6.Which is closest to 596 × 61? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  7. 7.Round 33.71 to one decimal place. =
  8. 8.Round 67728 to the nearest hundred.
  9. 9.Round 27.29 to one decimal place. =
  10. 10.Which is closest to 2795 ÷ 41? (a) 700 (b) 70 (c) 140 (d) 35
  11. 11.Which is closest to 403 × 49? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
  12. 12.Round 78149 to the nearest thousand.
  13. 13.Round 97.49 to one decimal place. =
  14. 14.Which is closest to 700 + 398 + 400? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  15. 15.Round 73505 to the nearest thousand.
  16. 16.Which is closest to 696 + 697 + 805? (a) 2300 (b) 2100 (c) 2200 (d) 2400
  17. 17.Round 47.21 to one decimal place. =
  18. 18.Which is closest to 498 + 902 + 905? (a) 2300 (b) 2200 (c) 2400 (d) 2500
  19. 19.Round 83.26 to one decimal place. =
  20. 20.Round 84778 to the nearest hundred.
  21. 21.Which is closest to 201 + 197 + 202? (a) 700 (b) 800 (c) 500 (d) 600
  22. 22.Which is closest to 3509 ÷ 49? (a) 700 (b) 140 (c) 35 (d) 70
  23. 23.Which is closest to 799 × 19? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  24. 24.Round 2871 to the nearest thousand.
  25. 25.Round 92.83 to one decimal place. =
  26. 26.Which is closest to 598 + 400 + 201? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  27. 27.Round 40.39 to one decimal place. =
  28. 28.Which is closest to 398 × 29? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  29. 29.Which is closest to 203 + 96 + 103? (a) 300 (b) 500 (c) 400 (d) 600
  30. 30.Round 96833 to the nearest thousand.
  31. 31.Which is closest to 604 + 603 + 102? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  32. 32.Round 34343 to the nearest thousand.
  33. 33.Which is closest to 698 × 31? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  34. 34.Round 6458 to the nearest thousand.
  35. 35.Which is closest to 604 + 599 + 397? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  36. 36.Round 50.09 to one decimal place. =
  37. 37.Round 21831 to the nearest ten.
  38. 38.Round 20.33 to one decimal place. =
  39. 39.Which is closest to 796 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  40. 40.Which is closest to 303 × 59? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000

Answer key

  1. 25.3
  2. 42000
  3. 60
  4. 43.4
  5. 77310
  6. 36000
  7. 33.7
  8. 67700
  9. 27.3
  10. 70
  11. 20000
  12. 78000
  13. 97.5
  14. 1500
  15. 74000
  16. 2200
  17. 47.2
  18. 2300
  19. 83.3
  20. 84800
  21. 600
  22. 70
  23. 16000
  24. 3000
  25. 92.8
  26. 1200
  27. 40.4
  28. 12000
  29. 400
  30. 97000
  31. 1300
  32. 34000
  33. 21000
  34. 6000
  35. 1600
  36. 50.1
  37. 21830
  38. 20.3
  39. 24000
  40. 18000

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