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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 474 · 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 195 + 699 + 97? (a) 900 (b) 1000 (c) 1100 (d) 1200
  2. 2.Round 58.36 to one decimal place. =
  3. 3.Which is closest to 597 × 20? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  4. 4.Which is closest to 97 + 103 + 197? (a) 500 (b) 300 (c) 600 (d) 400
  5. 5.Which is closest to 3596 ÷ 39? (a) 45 (b) 90 (c) 180 (d) 900
  6. 6.Which is closest to 3200 ÷ 39? (a) 160 (b) 800 (c) 40 (d) 80
  7. 7.Which is closest to 594 ÷ 29? (a) 40 (b) 10 (c) 20 (d) 200
  8. 8.Round 96.21 to one decimal place. =
  9. 9.Which is closest to 903 + 100 + 401? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  10. 10.Which is closest to 702 × 31? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  11. 11.Which is closest to 402 × 32? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  12. 12.Round 38.18 to one decimal place. =
  13. 13.Round 48123 to the nearest ten.
  14. 14.Which is closest to 602 × 72? (Round each number first.) (a) 4200 (b) 42000 (c) 420000 (d) 84000
  15. 15.Round 63.13 to one decimal place. =
  16. 16.Round 84512 to the nearest ten.
  17. 17.Round 74549 to the nearest ten.
  18. 18.Which is closest to 3598 ÷ 39? (a) 90 (b) 45 (c) 900 (d) 180
  19. 19.Which is closest to 299 × 68? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  20. 20.Which is closest to 903 + 505 + 601? (a) 2000 (b) 2200 (c) 2100 (d) 1900
  21. 21.Which is closest to 595 + 402 + 898? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  22. 22.Which is closest to 400 × 62? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  23. 23.Round 20089 to the nearest ten.
  24. 24.Round 95.67 to one decimal place. =
  25. 25.Which is closest to 699 + 597 + 895? (a) 2300 (b) 2400 (c) 2200 (d) 2100
  26. 26.Which is closest to 502 × 28? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  27. 27.Round 85665 to the nearest hundred.
  28. 28.Round 22.38 to one decimal place. =
  29. 29.Round 75651 to the nearest hundred.
  30. 30.Round 31.86 to one decimal place. =
  31. 31.Which is closest to 696 + 201 + 800? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  32. 32.Which is closest to 796 × 48? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  33. 33.Which is closest to 796 + 97 + 201? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  34. 34.Round 24.34 to one decimal place. =
  35. 35.Which is closest to 1396 ÷ 21? (a) 70 (b) 140 (c) 35 (d) 700
  36. 36.Which is closest to 600 × 19? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  37. 37.Which is closest to 504 × 81? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
  38. 38.Which is closest to 702 × 71? (Round each number first.) (a) 4900 (b) 490000 (c) 98000 (d) 49000
  39. 39.Which is closest to 597 × 31? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  40. 40.Which is closest to 902 + 697 + 198? (a) 2000 (b) 1700 (c) 1800 (d) 1900

Answer key

  1. 1000
  2. 58.4
  3. 12000
  4. 400
  5. 90
  6. 80
  7. 20
  8. 96.2
  9. 1400
  10. 21000
  11. 12000
  12. 38.2
  13. 48120
  14. 42000
  15. 63.1
  16. 84510
  17. 74550
  18. 90
  19. 21000
  20. 2000
  21. 1900
  22. 24000
  23. 20090
  24. 95.7
  25. 2200
  26. 15000
  27. 85700
  28. 22.4
  29. 75700
  30. 31.9
  31. 1700
  32. 40000
  33. 1100
  34. 24.3
  35. 70
  36. 12000
  37. 40000
  38. 49000
  39. 18000
  40. 1800

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