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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 8 · 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 401 × 29? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  2. 2.Which is closest to 701 × 58? (Round each number first.) (a) 42000 (b) 4200 (c) 84000 (d) 420000
  3. 3.Which is closest to 596 ÷ 31? (a) 20 (b) 10 (c) 200 (d) 40
  4. 4.Round 66604 to the nearest thousand.
  5. 5.Which is closest to 2701 ÷ 31? (a) 45 (b) 900 (c) 90 (d) 180
  6. 6.Round 29481 to the nearest ten.
  7. 7.Which is closest to 1398 ÷ 19? (a) 140 (b) 700 (c) 35 (d) 70
  8. 8.Which is closest to 901 × 21? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  9. 9.Round 99.43 to one decimal place. =
  10. 10.Which is closest to 700 + 303 + 797? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  11. 11.Which is closest to 198 × 69? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  12. 12.Round 49507 to the nearest hundred.
  13. 13.Round 35.89 to one decimal place. =
  14. 14.Round 85081 to the nearest thousand.
  15. 15.Which is closest to 199 + 302 + 498? (a) 1000 (b) 1100 (c) 900 (d) 1200
  16. 16.Which is closest to 603 ÷ 19? (a) 60 (b) 300 (c) 30 (d) 15
  17. 17.Which is closest to 199 × 28? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  18. 18.Round 98.77 to one decimal place. =
  19. 19.Round 85349 to the nearest ten.
  20. 20.Round 80.56 to one decimal place. =
  21. 21.Round 89.46 to one decimal place. =
  22. 22.Which is closest to 404 × 59? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  23. 23.Which is closest to 696 × 70? (Round each number first.) (a) 98000 (b) 4900 (c) 49000 (d) 490000
  24. 24.Which is closest to 398 × 61? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  25. 25.Which is closest to 396 + 300 + 99? (a) 900 (b) 800 (c) 700 (d) 1000
  26. 26.Which is closest to 101 + 98 + 796? (a) 1000 (b) 900 (c) 1200 (d) 1100
  27. 27.Which is closest to 596 × 62? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
  28. 28.Which is closest to 698 × 48? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  29. 29.Round 91.16 to one decimal place. =
  30. 30.Which is closest to 303 + 496 + 198? (a) 1200 (b) 1000 (c) 1100 (d) 900
  31. 31.Which is closest to 2798 ÷ 41? (a) 35 (b) 140 (c) 700 (d) 70
  32. 32.Which is closest to 297 × 62? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  33. 33.Round 6195 to the nearest thousand.
  34. 34.Which is closest to 399 × 18? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  35. 35.Which is closest to 1605 ÷ 39? (a) 80 (b) 20 (c) 40 (d) 400
  36. 36.Which is closest to 597 × 28? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  37. 37.Which is closest to 901 + 598 + 301? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  38. 38.Which is closest to 2008 ÷ 39? (a) 25 (b) 500 (c) 100 (d) 50
  39. 39.Round 10123 to the nearest hundred.
  40. 40.Round 3829 to the nearest thousand.

Answer key

  1. 12000
  2. 42000
  3. 20
  4. 67000
  5. 90
  6. 29480
  7. 70
  8. 18000
  9. 99.4
  10. 1800
  11. 14000
  12. 49500
  13. 35.9
  14. 85000
  15. 1000
  16. 30
  17. 6000
  18. 98.8
  19. 85350
  20. 80.6
  21. 89.5
  22. 24000
  23. 49000
  24. 24000
  25. 800
  26. 1000
  27. 36000
  28. 35000
  29. 91.2
  30. 1000
  31. 70
  32. 18000
  33. 6000
  34. 8000
  35. 40
  36. 18000
  37. 1800
  38. 50
  39. 10100
  40. 4000

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