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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 319 · 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 899 × 48? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  2. 2.Which is closest to 602 + 102 + 802? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  3. 3.Which is closest to 295 + 196 + 603? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  4. 4.Which is closest to 399 × 31? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  5. 5.Which is closest to 2804 ÷ 39? (a) 140 (b) 700 (c) 70 (d) 35
  6. 6.Which is closest to 598 + 895 + 498? (a) 1900 (b) 2000 (c) 2100 (d) 2200
  7. 7.Round 19893 to the nearest ten.
  8. 8.Round 31221 to the nearest ten.
  9. 9.Which is closest to 696 × 41? (Round each number first.) (a) 2800 (b) 28000 (c) 56000 (d) 280000
  10. 10.Which is closest to 897 × 19? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  11. 11.Round 53260 to the nearest thousand.
  12. 12.Which is closest to 297 + 600 + 895? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  13. 13.Which is closest to 900 + 401 + 199? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  14. 14.Which is closest to 698 × 68? (Round each number first.) (a) 98000 (b) 490000 (c) 4900 (d) 49000
  15. 15.Which is closest to 392 ÷ 19? (a) 20 (b) 40 (c) 200 (d) 10
  16. 16.Which is closest to 593 ÷ 29? (a) 200 (b) 10 (c) 20 (d) 40
  17. 17.Round 69711 to the nearest ten.
  18. 18.Round 99.42 to one decimal place. =
  19. 19.Which is closest to 299 × 28? (Round each number first.) (a) 90000 (b) 9000 (c) 18000 (d) 900
  20. 20.Round 75.49 to one decimal place. =
  21. 21.Which is closest to 105 + 103 + 96? (a) 500 (b) 300 (c) 200 (d) 400
  22. 22.Which is closest to 3501 ÷ 49? (a) 35 (b) 70 (c) 700 (d) 140
  23. 23.Round 80528 to the nearest thousand.
  24. 24.Round 61.93 to one decimal place. =
  25. 25.Round 83.56 to one decimal place. =
  26. 26.Round 76.37 to one decimal place. =
  27. 27.Which is closest to 600 × 22? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  28. 28.Which is closest to 95 + 295 + 395? (a) 900 (b) 800 (c) 700 (d) 1000
  29. 29.Round 22.64 to one decimal place. =
  30. 30.Which is closest to 899 + 399 + 404? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  31. 31.Which is closest to 396 × 18? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  32. 32.Which is closest to 496 + 700 + 401? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  33. 33.Which is closest to 798 ÷ 39? (a) 10 (b) 200 (c) 20 (d) 40
  34. 34.Round 29.31 to one decimal place. =
  35. 35.Which is closest to 204 + 405 + 696? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  36. 36.Round 29.76 to one decimal place. =
  37. 37.Round 12.59 to one decimal place. =
  38. 38.Round 6359 to the nearest ten.
  39. 39.Round 13654 to the nearest hundred.
  40. 40.Which is closest to 696 × 69? (Round each number first.) (a) 490000 (b) 49000 (c) 4900 (d) 98000

Answer key

  1. 45000
  2. 1500
  3. 1100
  4. 12000
  5. 70
  6. 2000
  7. 19890
  8. 31220
  9. 28000
  10. 18000
  11. 53000
  12. 1800
  13. 1500
  14. 49000
  15. 20
  16. 20
  17. 69710
  18. 99.4
  19. 9000
  20. 75.5
  21. 300
  22. 70
  23. 81000
  24. 61.9
  25. 83.6
  26. 76.4
  27. 12000
  28. 800
  29. 22.6
  30. 1700
  31. 8000
  32. 1600
  33. 20
  34. 29.3
  35. 1300
  36. 29.8
  37. 12.6
  38. 6360
  39. 13700
  40. 49000

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