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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 676 · 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 299 × 51? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  2. 2.Which is closest to 904 × 21? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  3. 3.Round 2473 to the nearest thousand.
  4. 4.Round 88.07 to one decimal place. =
  5. 5.Which is closest to 702 + 195 + 403? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  6. 6.Round 25.27 to one decimal place. =
  7. 7.Round 49.29 to one decimal place. =
  8. 8.Round 43549 to the nearest hundred.
  9. 9.Which is closest to 803 × 28? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  10. 10.Round 14494 to the nearest ten.
  11. 11.Which is closest to 297 × 39? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  12. 12.Round 37.72 to one decimal place. =
  13. 13.Which is closest to 400 × 39? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  14. 14.Which is closest to 505 + 95 + 500? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  15. 15.Which is closest to 302 + 403 + 903? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  16. 16.Which is closest to 1004 ÷ 21? (a) 100 (b) 25 (c) 500 (d) 50
  17. 17.Which is closest to 502 × 70? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  18. 18.Which is closest to 303 + 797 + 303? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  19. 19.Round 39.22 to one decimal place. =
  20. 20.Round 86189 to the nearest ten.
  21. 21.Which is closest to 396 ÷ 21? (a) 40 (b) 10 (c) 20 (d) 200
  22. 22.Which is closest to 200 + 504 + 897? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  23. 23.Which is closest to 798 ÷ 19? (a) 400 (b) 40 (c) 20 (d) 80
  24. 24.Round 20.38 to one decimal place. =
  25. 25.Round 86675 to the nearest thousand.
  26. 26.Round 36.48 to one decimal place. =
  27. 27.Round 96.87 to one decimal place. =
  28. 28.Which is closest to 796 × 50? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  29. 29.Which is closest to 400 × 82? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  30. 30.Which is closest to 1491 ÷ 29? (a) 25 (b) 500 (c) 50 (d) 100
  31. 31.Which is closest to 2506 ÷ 51? (a) 100 (b) 25 (c) 50 (d) 500
  32. 32.Round 56154 to the nearest ten.
  33. 33.Which is closest to 596 × 81? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  34. 34.Round 97.72 to one decimal place. =
  35. 35.Which is closest to 496 × 70? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  36. 36.Which is closest to 902 + 200 + 300? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  37. 37.Which is closest to 203 × 80? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  38. 38.Round 37.22 to one decimal place. =
  39. 39.Which is closest to 403 × 18? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  40. 40.Which is closest to 896 × 72? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000

Answer key

  1. 15000
  2. 18000
  3. 2000
  4. 88.1
  5. 1300
  6. 25.3
  7. 49.3
  8. 43500
  9. 24000
  10. 14490
  11. 12000
  12. 37.7
  13. 16000
  14. 1100
  15. 1600
  16. 50
  17. 35000
  18. 1400
  19. 39.2
  20. 86190
  21. 20
  22. 1600
  23. 40
  24. 20.4
  25. 87000
  26. 36.5
  27. 96.9
  28. 40000
  29. 32000
  30. 50
  31. 50
  32. 56150
  33. 48000
  34. 97.7
  35. 35000
  36. 1400
  37. 16000
  38. 37.2
  39. 8000
  40. 63000

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