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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 673 · 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 69.71 to one decimal place. =
  2. 2.Which is closest to 397 × 52? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  3. 3.Which is closest to 1199 ÷ 29? (a) 80 (b) 20 (c) 40 (d) 400
  4. 4.Which is closest to 895 + 595 + 203? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  5. 5.Which is closest to 404 × 81? (Round each number first.) (a) 64000 (b) 3200 (c) 32000 (d) 320000
  6. 6.Which is closest to 102 + 896 + 602? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  7. 7.Round 52011 to the nearest ten.
  8. 8.Which is closest to 700 × 72? (Round each number first.) (a) 4900 (b) 49000 (c) 98000 (d) 490000
  9. 9.Round 73.38 to one decimal place. =
  10. 10.Which is closest to 205 + 505 + 803? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  11. 11.Which is closest to 1209 ÷ 41? (a) 300 (b) 15 (c) 30 (d) 60
  12. 12.Which is closest to 695 + 496 + 605? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  13. 13.Round 45.48 to one decimal place. =
  14. 14.Round 29944 to the nearest hundred.
  15. 15.Which is closest to 603 + 400 + 501? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  16. 16.Which is closest to 197 × 21? (Round each number first.) (a) 4000 (b) 40000 (c) 400 (d) 8000
  17. 17.Which is closest to 901 × 31? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  18. 18.Round 33.18 to one decimal place. =
  19. 19.Round 86204 to the nearest thousand.
  20. 20.Which is closest to 1396 ÷ 19? (a) 70 (b) 140 (c) 35 (d) 700
  21. 21.Round 76.91 to one decimal place. =
  22. 22.Which is closest to 799 × 42? (Round each number first.) (a) 64000 (b) 320000 (c) 32000 (d) 3200
  23. 23.Which is closest to 303 + 898 + 595? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  24. 24.Round 16040 to the nearest hundred.
  25. 25.Which is closest to 793 ÷ 21? (a) 400 (b) 20 (c) 80 (d) 40
  26. 26.Which is closest to 598 + 400 + 895? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  27. 27.Round 27.54 to one decimal place. =
  28. 28.Which is closest to 603 + 498 + 502? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  29. 29.Round 55.09 to one decimal place. =
  30. 30.Which is closest to 399 + 595 + 699? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  31. 31.Which is closest to 703 + 302 + 502? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  32. 32.Which is closest to 297 × 59? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  33. 33.Which is closest to 301 × 52? (Round each number first.) (a) 15000 (b) 150000 (c) 30000 (d) 1500
  34. 34.Which is closest to 296 × 30? (Round each number first.) (a) 900 (b) 9000 (c) 90000 (d) 18000
  35. 35.Round 98.23 to one decimal place. =
  36. 36.Round 57648 to the nearest thousand.
  37. 37.Which is closest to 696 × 62? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  38. 38.Which is closest to 2999 ÷ 49? (a) 30 (b) 60 (c) 120 (d) 600
  39. 39.Round 50286 to the nearest ten.
  40. 40.Round 62576 to the nearest hundred.

Answer key

  1. 69.7
  2. 20000
  3. 40
  4. 1700
  5. 32000
  6. 1600
  7. 52010
  8. 49000
  9. 73.4
  10. 1500
  11. 30
  12. 1800
  13. 45.5
  14. 29900
  15. 1500
  16. 4000
  17. 27000
  18. 33.2
  19. 86000
  20. 70
  21. 76.9
  22. 32000
  23. 1800
  24. 16000
  25. 40
  26. 1900
  27. 27.5
  28. 1600
  29. 55.1
  30. 1700
  31. 1500
  32. 18000
  33. 15000
  34. 9000
  35. 98.2
  36. 58000
  37. 42000
  38. 60
  39. 50290
  40. 62600

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