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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 695 · 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 197 + 895 + 795? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  2. 2.Which is closest to 498 × 92? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  3. 3.Round 64.44 to one decimal place. =
  4. 4.Which is closest to 503 + 395 + 495? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  5. 5.Round 78158 to the nearest hundred.
  6. 6.Round 23013 to the nearest hundred.
  7. 7.Which is closest to 697 + 595 + 298? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  8. 8.Which is closest to 198 × 88? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  9. 9.Which is closest to 2505 ÷ 51? (a) 100 (b) 50 (c) 500 (d) 25
  10. 10.Which is closest to 1507 ÷ 51? (a) 300 (b) 15 (c) 30 (d) 60
  11. 11.Which is closest to 202 × 20? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  12. 12.Which is closest to 401 × 92? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  13. 13.Round 78096 to the nearest thousand.
  14. 14.Which is closest to 1591 ÷ 39? (a) 20 (b) 40 (c) 80 (d) 400
  15. 15.Which is closest to 2400 ÷ 41? (a) 600 (b) 60 (c) 30 (d) 120
  16. 16.Which is closest to 305 + 97 + 402? (a) 800 (b) 1000 (c) 700 (d) 900
  17. 17.Which is closest to 2001 ÷ 39? (a) 500 (b) 100 (c) 50 (d) 25
  18. 18.Round 11.17 to one decimal place. =
  19. 19.Which is closest to 2995 ÷ 51? (a) 60 (b) 120 (c) 600 (d) 30
  20. 20.Round 59376 to the nearest thousand.
  21. 21.Which is closest to 697 × 70? (Round each number first.) (a) 490000 (b) 98000 (c) 4900 (d) 49000
  22. 22.Which is closest to 2393 ÷ 41? (a) 30 (b) 600 (c) 60 (d) 120
  23. 23.Round 21.33 to one decimal place. =
  24. 24.Which is closest to 597 × 48? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
  25. 25.Which is closest to 105 + 796 + 702? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  26. 26.Which is closest to 797 × 39? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  27. 27.Which is closest to 202 + 97 + 900? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  28. 28.Which is closest to 700 + 700 + 95? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  29. 29.Round 79.17 to one decimal place. =
  30. 30.Which is closest to 1597 ÷ 39? (a) 400 (b) 40 (c) 20 (d) 80
  31. 31.Which is closest to 203 + 905 + 202? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  32. 32.Round 57.22 to one decimal place. =
  33. 33.Round 20649 to the nearest thousand.
  34. 34.Which is closest to 902 × 42? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  35. 35.Which is closest to 803 × 42? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  36. 36.Which is closest to 701 × 92? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  37. 37.Which is closest to 1508 ÷ 49? (a) 60 (b) 300 (c) 15 (d) 30
  38. 38.Which is closest to 302 × 29? (Round each number first.) (a) 9000 (b) 18000 (c) 90000 (d) 900
  39. 39.Which is closest to 3004 ÷ 51? (a) 60 (b) 30 (c) 600 (d) 120
  40. 40.Which is closest to 3009 ÷ 51? (a) 120 (b) 60 (c) 600 (d) 30

Answer key

  1. 1900
  2. 45000
  3. 64.4
  4. 1400
  5. 78200
  6. 23000
  7. 1600
  8. 18000
  9. 50
  10. 30
  11. 4000
  12. 36000
  13. 78000
  14. 40
  15. 60
  16. 800
  17. 50
  18. 11.2
  19. 60
  20. 59000
  21. 49000
  22. 60
  23. 21.3
  24. 30000
  25. 1600
  26. 32000
  27. 1200
  28. 1500
  29. 79.2
  30. 40
  31. 1300
  32. 57.2
  33. 21000
  34. 36000
  35. 32000
  36. 63000
  37. 30
  38. 9000
  39. 60
  40. 60

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