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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 406 · 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 805 + 97 + 503? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  2. 2.Round 47498 to the nearest hundred.
  3. 3.Which is closest to 2696 ÷ 29? (a) 45 (b) 90 (c) 900 (d) 180
  4. 4.Which is closest to 3201 ÷ 39? (a) 800 (b) 160 (c) 40 (d) 80
  5. 5.Which is closest to 395 + 499 + 795? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  6. 6.Which is closest to 505 + 601 + 298? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  7. 7.Which is closest to 499 × 21? (Round each number first.) (a) 10000 (b) 100000 (c) 20000 (d) 1000
  8. 8.Round 46.64 to one decimal place. =
  9. 9.Round 19.54 to one decimal place. =
  10. 10.Which is closest to 200 + 695 + 900? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  11. 11.Which is closest to 201 + 496 + 599? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  12. 12.Round 73.88 to one decimal place. =
  13. 13.Round 53494 to the nearest hundred.
  14. 14.Which is closest to 599 × 40? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  15. 15.Which is closest to 2801 ÷ 39? (a) 35 (b) 70 (c) 700 (d) 140
  16. 16.Which is closest to 3493 ÷ 49? (a) 70 (b) 700 (c) 140 (d) 35
  17. 17.Which is closest to 2393 ÷ 41? (a) 600 (b) 30 (c) 60 (d) 120
  18. 18.Which is closest to 896 × 29? (Round each number first.) (a) 2700 (b) 270000 (c) 54000 (d) 27000
  19. 19.Round 49.19 to one decimal place. =
  20. 20.Which is closest to 199 × 38? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  21. 21.Round 76.12 to one decimal place. =
  22. 22.Round 80.66 to one decimal place. =
  23. 23.Which is closest to 800 + 698 + 197? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  24. 24.Which is closest to 404 + 399 + 201? (a) 1200 (b) 1000 (c) 900 (d) 1100
  25. 25.Round 44.58 to one decimal place. =
  26. 26.Which is closest to 1591 ÷ 39? (a) 40 (b) 20 (c) 400 (d) 80
  27. 27.Which is closest to 902 × 50? (Round each number first.) (a) 4500 (b) 450000 (c) 45000 (d) 90000
  28. 28.Which is closest to 802 × 18? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  29. 29.Which is closest to 198 × 31? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  30. 30.Which is closest to 3601 ÷ 41? (a) 45 (b) 900 (c) 180 (d) 90
  31. 31.Round 1112 to the nearest hundred.
  32. 32.Round 85.59 to one decimal place. =
  33. 33.Which is closest to 299 × 61? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  34. 34.Which is closest to 198 × 81? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  35. 35.Round 49.46 to one decimal place. =
  36. 36.Which is closest to 802 × 40? (Round each number first.) (a) 64000 (b) 32000 (c) 3200 (d) 320000
  37. 37.Round 29.09 to one decimal place. =
  38. 38.Which is closest to 1794 ÷ 29? (a) 120 (b) 60 (c) 30 (d) 600
  39. 39.Round 48.34 to one decimal place. =
  40. 40.Round 73.19 to one decimal place. =

Answer key

  1. 1400
  2. 47500
  3. 90
  4. 80
  5. 1700
  6. 1400
  7. 10000
  8. 46.6
  9. 19.5
  10. 1800
  11. 1300
  12. 73.9
  13. 53500
  14. 24000
  15. 70
  16. 70
  17. 60
  18. 27000
  19. 49.2
  20. 8000
  21. 76.1
  22. 80.7
  23. 1700
  24. 1000
  25. 44.6
  26. 40
  27. 45000
  28. 16000
  29. 6000
  30. 90
  31. 1100
  32. 85.6
  33. 18000
  34. 16000
  35. 49.5
  36. 32000
  37. 29.1
  38. 60
  39. 48.3
  40. 73.2

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