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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 374 · 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 31.42 to one decimal place. =
  2. 2.Which is closest to 200 × 42? (Round each number first.) (a) 800 (b) 8000 (c) 16000 (d) 80000
  3. 3.Which is closest to 905 + 495 + 799? (a) 2400 (b) 2300 (c) 2200 (d) 2100
  4. 4.Round 95.84 to one decimal place. =
  5. 5.Which is closest to 799 × 19? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  6. 6.Which is closest to 799 + 802 + 900? (a) 2700 (b) 2400 (c) 2500 (d) 2600
  7. 7.Which is closest to 302 × 29? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  8. 8.Round 18.48 to one decimal place. =
  9. 9.Which is closest to 97 + 297 + 304? (a) 900 (b) 700 (c) 600 (d) 800
  10. 10.Round 76.73 to one decimal place. =
  11. 11.Which is closest to 196 + 699 + 397? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  12. 12.Round 54.72 to one decimal place. =
  13. 13.Which is closest to 304 × 51? (Round each number first.) (a) 30000 (b) 1500 (c) 150000 (d) 15000
  14. 14.Which is closest to 2391 ÷ 31? (a) 800 (b) 40 (c) 80 (d) 160
  15. 15.Which is closest to 402 + 298 + 403? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  16. 16.Which is closest to 597 × 68? (Round each number first.) (a) 4200 (b) 42000 (c) 84000 (d) 420000
  17. 17.Which is closest to 593 ÷ 21? (a) 30 (b) 300 (c) 60 (d) 15
  18. 18.Which is closest to 898 × 78? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  19. 19.Which is closest to 304 × 18? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000
  20. 20.Round 93951 to the nearest thousand.
  21. 21.Round 7509 to the nearest thousand.
  22. 22.Which is closest to 396 + 203 + 500? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  23. 23.Which is closest to 1803 ÷ 19? (a) 45 (b) 900 (c) 90 (d) 180
  24. 24.Round 84.44 to one decimal place. =
  25. 25.Which is closest to 400 + 903 + 596? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  26. 26.Which is closest to 1202 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  27. 27.Round 61081 to the nearest thousand.
  28. 28.Which is closest to 901 + 797 + 601? (a) 2400 (b) 2200 (c) 2500 (d) 2300
  29. 29.Which is closest to 900 × 91? (Round each number first.) (a) 162000 (b) 81000 (c) 810000 (d) 8100
  30. 30.Round 91.59 to one decimal place. =
  31. 31.Round 77976 to the nearest hundred.
  32. 32.Which is closest to 503 × 18? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
  33. 33.Round 32133 to the nearest hundred.
  34. 34.Round 71140 to the nearest hundred.
  35. 35.Round 38306 to the nearest ten.
  36. 36.Round 49338 to the nearest hundred.
  37. 37.Which is closest to 397 × 29? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  38. 38.Which is closest to 3599 ÷ 39? (a) 180 (b) 900 (c) 90 (d) 45
  39. 39.Which is closest to 2006 ÷ 39? (a) 500 (b) 25 (c) 100 (d) 50
  40. 40.Which is closest to 604 ÷ 19? (a) 60 (b) 15 (c) 300 (d) 30

Answer key

  1. 31.4
  2. 8000
  3. 2200
  4. 95.8
  5. 16000
  6. 2500
  7. 9000
  8. 18.5
  9. 700
  10. 76.7
  11. 1300
  12. 54.7
  13. 15000
  14. 80
  15. 1100
  16. 42000
  17. 30
  18. 72000
  19. 6000
  20. 94000
  21. 8000
  22. 1100
  23. 90
  24. 84.4
  25. 1900
  26. 60
  27. 61000
  28. 2300
  29. 81000
  30. 91.6
  31. 78000
  32. 10000
  33. 32100
  34. 71100
  35. 38310
  36. 49300
  37. 12000
  38. 90
  39. 50
  40. 30

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