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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 139 · 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 200 × 59? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  2. 2.Round 82573 to the nearest ten.
  3. 3.Which is closest to 402 + 297 + 203? (a) 900 (b) 800 (c) 1000 (d) 1100
  4. 4.Which is closest to 403 + 701 + 700? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  5. 5.Which is closest to 601 ÷ 31? (a) 20 (b) 10 (c) 200 (d) 40
  6. 6.Round 84279 to the nearest ten.
  7. 7.Round 22278 to the nearest ten.
  8. 8.Which is closest to 399 × 51? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  9. 9.Which is closest to 203 × 28? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  10. 10.Round 83330 to the nearest thousand.
  11. 11.Round 87.47 to one decimal place. =
  12. 12.Round 15.63 to one decimal place. =
  13. 13.Which is closest to 595 ÷ 21? (a) 300 (b) 60 (c) 30 (d) 15
  14. 14.Which is closest to 4004 ÷ 49? (a) 40 (b) 80 (c) 800 (d) 160
  15. 15.Which is closest to 704 + 203 + 298? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  16. 16.Round 30.73 to one decimal place. =
  17. 17.Which is closest to 3992 ÷ 49? (a) 40 (b) 160 (c) 800 (d) 80
  18. 18.Round 44017 to the nearest hundred.
  19. 19.Which is closest to 1194 ÷ 39? (a) 30 (b) 60 (c) 300 (d) 15
  20. 20.Round 60.56 to one decimal place. =
  21. 21.Which is closest to 696 + 802 + 97? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  22. 22.Which is closest to 699 + 197 + 705? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  23. 23.Which is closest to 197 + 104 + 797? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  24. 24.Round 85.41 to one decimal place. =
  25. 25.Round 57079 to the nearest ten.
  26. 26.Which is closest to 102 + 795 + 702? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  27. 27.Which is closest to 1504 ÷ 51? (a) 300 (b) 30 (c) 60 (d) 15
  28. 28.Which is closest to 1609 ÷ 19? (a) 160 (b) 80 (c) 800 (d) 40
  29. 29.Which is closest to 899 × 32? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  30. 30.Round 36727 to the nearest hundred.
  31. 31.Which is closest to 196 × 58? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  32. 32.Which is closest to 799 ÷ 39? (a) 20 (b) 40 (c) 10 (d) 200
  33. 33.Which is closest to 95 + 100 + 797? (a) 1000 (b) 1200 (c) 1100 (d) 900
  34. 34.Which is closest to 1795 ÷ 19? (a) 90 (b) 180 (c) 900 (d) 45
  35. 35.Which is closest to 96 + 305 + 95? (a) 600 (b) 700 (c) 500 (d) 400
  36. 36.Round 57733 to the nearest hundred.
  37. 37.Round 18.81 to one decimal place. =
  38. 38.Round 47387 to the nearest thousand.
  39. 39.Which is closest to 3609 ÷ 39? (a) 180 (b) 90 (c) 900 (d) 45
  40. 40.Which is closest to 298 + 503 + 702? (a) 1500 (b) 1400 (c) 1700 (d) 1600

Answer key

  1. 12000
  2. 82570
  3. 900
  4. 1800
  5. 20
  6. 84280
  7. 22280
  8. 20000
  9. 6000
  10. 83000
  11. 87.5
  12. 15.6
  13. 30
  14. 80
  15. 1200
  16. 30.7
  17. 80
  18. 44000
  19. 30
  20. 60.6
  21. 1600
  22. 1600
  23. 1100
  24. 85.4
  25. 57080
  26. 1600
  27. 30
  28. 80
  29. 27000
  30. 36700
  31. 12000
  32. 20
  33. 1000
  34. 90
  35. 500
  36. 57700
  37. 18.8
  38. 47000
  39. 90
  40. 1500

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