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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 593 · 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 27810 to the nearest hundred.
  2. 2.Round 98710 to the nearest hundred.
  3. 3.Which is closest to 896 + 405 + 196? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  4. 4.Which is closest to 2692 ÷ 31? (a) 45 (b) 180 (c) 900 (d) 90
  5. 5.Round 77.21 to one decimal place. =
  6. 6.Round 98659 to the nearest ten.
  7. 7.Round 83.31 to one decimal place. =
  8. 8.Which is closest to 696 + 95 + 101? (a) 800 (b) 900 (c) 1100 (d) 1000
  9. 9.Which is closest to 899 + 496 + 505? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  10. 10.Which is closest to 399 × 81? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
  11. 11.Which is closest to 1192 ÷ 29? (a) 80 (b) 40 (c) 20 (d) 400
  12. 12.Which is closest to 403 + 397 + 602? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  13. 13.Which is closest to 604 + 396 + 298? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  14. 14.Round 94188 to the nearest thousand.
  15. 15.Which is closest to 896 × 18? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  16. 16.Which is closest to 603 + 202 + 495? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  17. 17.Round 58.54 to one decimal place. =
  18. 18.Which is closest to 696 × 31? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  19. 19.Round 23.27 to one decimal place. =
  20. 20.Round 37.26 to one decimal place. =
  21. 21.Round 18399 to the nearest hundred.
  22. 22.Which is closest to 797 × 32? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  23. 23.Round 62.11 to one decimal place. =
  24. 24.Round 31.17 to one decimal place. =
  25. 25.Round 66.78 to one decimal place. =
  26. 26.Which is closest to 396 ÷ 21? (a) 10 (b) 200 (c) 40 (d) 20
  27. 27.Which is closest to 504 + 496 + 598? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  28. 28.Which is closest to 302 + 804 + 798? (a) 1900 (b) 2100 (c) 1800 (d) 2000
  29. 29.Which is closest to 395 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
  30. 30.Round 82.43 to one decimal place. =
  31. 31.Round 37.63 to one decimal place. =
  32. 32.Round 26.11 to one decimal place. =
  33. 33.Round 34895 to the nearest hundred.
  34. 34.Which is closest to 699 × 40? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  35. 35.Round 61246 to the nearest thousand.
  36. 36.Which is closest to 197 + 202 + 203? (a) 500 (b) 700 (c) 600 (d) 800
  37. 37.Round 35.79 to one decimal place. =
  38. 38.Which is closest to 702 + 796 + 904? (a) 2600 (b) 2400 (c) 2300 (d) 2500
  39. 39.Which is closest to 598 × 19? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  40. 40.Which is closest to 992 ÷ 21? (a) 100 (b) 25 (c) 50 (d) 500

Answer key

  1. 27800
  2. 98700
  3. 1500
  4. 90
  5. 77.2
  6. 98660
  7. 83.3
  8. 900
  9. 1900
  10. 32000
  11. 40
  12. 1400
  13. 1300
  14. 94000
  15. 18000
  16. 1300
  17. 58.5
  18. 21000
  19. 23.3
  20. 37.3
  21. 18400
  22. 24000
  23. 62.1
  24. 31.2
  25. 66.8
  26. 20
  27. 1600
  28. 1900
  29. 20
  30. 82.4
  31. 37.6
  32. 26.1
  33. 34900
  34. 28000
  35. 61000
  36. 600
  37. 35.8
  38. 2400
  39. 12000
  40. 50

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