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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 2 · 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 303 × 41? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  2. 2.Which is closest to 696 × 30? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
  3. 3.Round 57133 to the nearest thousand.
  4. 4.Which is closest to 404 + 397 + 502? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  5. 5.Which is closest to 196 × 40? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  6. 6.Which is closest to 2395 ÷ 31? (a) 40 (b) 160 (c) 800 (d) 80
  7. 7.Which is closest to 802 + 503 + 296? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  8. 8.Which is closest to 396 + 99 + 398? (a) 1100 (b) 800 (c) 1000 (d) 900
  9. 9.Which is closest to 500 × 19? (Round each number first.) (a) 10000 (b) 100000 (c) 20000 (d) 1000
  10. 10.Round 21315 to the nearest hundred.
  11. 11.Round 17479 to the nearest thousand.
  12. 12.Which is closest to 993 ÷ 49? (a) 10 (b) 40 (c) 200 (d) 20
  13. 13.Which is closest to 398 × 50? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  14. 14.Round 85.73 to one decimal place. =
  15. 15.Which is closest to 1506 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
  16. 16.Which is closest to 702 × 29? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  17. 17.Round 91.72 to one decimal place. =
  18. 18.Round 26138 to the nearest ten.
  19. 19.Round 87023 to the nearest ten.
  20. 20.Which is closest to 898 × 80? (Round each number first.) (a) 72000 (b) 720000 (c) 7200 (d) 144000
  21. 21.Round 60.07 to one decimal place. =
  22. 22.Which is closest to 696 × 92? (Round each number first.) (a) 630000 (b) 63000 (c) 126000 (d) 6300
  23. 23.Round 96.71 to one decimal place. =
  24. 24.Which is closest to 497 × 18? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  25. 25.Round 99.07 to one decimal place. =
  26. 26.Which is closest to 200 + 201 + 198? (a) 500 (b) 700 (c) 600 (d) 800
  27. 27.Which is closest to 3507 ÷ 51? (a) 70 (b) 700 (c) 140 (d) 35
  28. 28.Which is closest to 499 + 798 + 198? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  29. 29.Which is closest to 604 + 701 + 300? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  30. 30.Which is closest to 2009 ÷ 49? (a) 80 (b) 20 (c) 400 (d) 40
  31. 31.Round 34.07 to one decimal place. =
  32. 32.Round 80.63 to one decimal place. =
  33. 33.Which is closest to 200 + 895 + 599? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  34. 34.Which is closest to 95 + 905 + 502? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  35. 35.Which is closest to 1005 ÷ 49? (a) 10 (b) 40 (c) 20 (d) 200
  36. 36.Round 15.47 to one decimal place. =
  37. 37.Which is closest to 1797 ÷ 19? (a) 180 (b) 900 (c) 45 (d) 90
  38. 38.Which is closest to 801 ÷ 41? (a) 40 (b) 10 (c) 20 (d) 200
  39. 39.Which is closest to 1002 ÷ 21? (a) 500 (b) 100 (c) 50 (d) 25
  40. 40.Which is closest to 703 × 39? (Round each number first.) (a) 28000 (b) 280000 (c) 2800 (d) 56000

Answer key

  1. 12000
  2. 21000
  3. 57000
  4. 1300
  5. 8000
  6. 80
  7. 1600
  8. 900
  9. 10000
  10. 21300
  11. 17000
  12. 20
  13. 20000
  14. 85.7
  15. 50
  16. 21000
  17. 91.7
  18. 26140
  19. 87020
  20. 72000
  21. 60.1
  22. 63000
  23. 96.7
  24. 10000
  25. 99.1
  26. 600
  27. 70
  28. 1500
  29. 1600
  30. 40
  31. 34.1
  32. 80.6
  33. 1700
  34. 1500
  35. 20
  36. 15.5
  37. 90
  38. 20
  39. 50
  40. 28000

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