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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 83 · 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 297 + 203 + 902? (a) 1400 (b) 1500 (c) 1600 (d) 1300
  2. 2.Which is closest to 298 × 31? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  3. 3.Round 71.39 to one decimal place. =
  4. 4.Which is closest to 896 × 21? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  5. 5.Round 41.17 to one decimal place. =
  6. 6.Round 95.82 to one decimal place. =
  7. 7.Which is closest to 897 × 71? (Round each number first.) (a) 6300 (b) 630000 (c) 126000 (d) 63000
  8. 8.Round 48.63 to one decimal place. =
  9. 9.Which is closest to 500 + 604 + 902? (a) 2100 (b) 1900 (c) 2000 (d) 2200
  10. 10.Which is closest to 2002 ÷ 41? (a) 25 (b) 50 (c) 500 (d) 100
  11. 11.Which is closest to 898 × 40? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  12. 12.Round 72114 to the nearest ten.
  13. 13.Which is closest to 2397 ÷ 39? (a) 120 (b) 600 (c) 30 (d) 60
  14. 14.Which is closest to 796 × 71? (Round each number first.) (a) 56000 (b) 5600 (c) 560000 (d) 112000
  15. 15.Round 74.09 to one decimal place. =
  16. 16.Round 89.44 to one decimal place. =
  17. 17.Round 83.71 to one decimal place. =
  18. 18.Round 66.66 to one decimal place. =
  19. 19.Which is closest to 2796 ÷ 39? (a) 70 (b) 35 (c) 700 (d) 140
  20. 20.Which is closest to 304 × 80? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  21. 21.Which is closest to 3509 ÷ 51? (a) 140 (b) 700 (c) 35 (d) 70
  22. 22.Which is closest to 202 × 70? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400
  23. 23.Round 12.62 to one decimal place. =
  24. 24.Which is closest to 397 + 703 + 198? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  25. 25.Round 45911 to the nearest ten.
  26. 26.Which is closest to 402 × 39? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  27. 27.Which is closest to 797 × 61? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  28. 28.Which is closest to 597 + 899 + 301? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  29. 29.Which is closest to 301 × 28? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
  30. 30.Which is closest to 1993 ÷ 49? (a) 80 (b) 20 (c) 40 (d) 400
  31. 31.Which is closest to 402 × 79? (Round each number first.) (a) 32000 (b) 64000 (c) 3200 (d) 320000
  32. 32.Which is closest to 99 + 501 + 95? (a) 600 (b) 800 (c) 900 (d) 700
  33. 33.Which is closest to 804 + 304 + 497? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  34. 34.Round 86.39 to one decimal place. =
  35. 35.Which is closest to 2496 ÷ 51? (a) 50 (b) 25 (c) 100 (d) 500
  36. 36.Round 10558 to the nearest thousand.
  37. 37.Which is closest to 601 × 62? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  38. 38.Round 27.82 to one decimal place. =
  39. 39.Which is closest to 504 + 101 + 795? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  40. 40.Which is closest to 3206 ÷ 39? (a) 80 (b) 800 (c) 160 (d) 40

Answer key

  1. 1400
  2. 9000
  3. 71.4
  4. 18000
  5. 41.2
  6. 95.8
  7. 63000
  8. 48.6
  9. 2000
  10. 50
  11. 36000
  12. 72110
  13. 60
  14. 56000
  15. 74.1
  16. 89.4
  17. 83.7
  18. 66.7
  19. 70
  20. 24000
  21. 70
  22. 14000
  23. 12.6
  24. 1300
  25. 45910
  26. 16000
  27. 48000
  28. 1800
  29. 9000
  30. 40
  31. 32000
  32. 700
  33. 1600
  34. 86.4
  35. 50
  36. 11000
  37. 36000
  38. 27.8
  39. 1400
  40. 80

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