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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 713 · 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.Round 60158 to the nearest ten.
  2. 2.Which is closest to 205 + 301 + 303? (a) 900 (b) 700 (c) 1000 (d) 800
  3. 3.Round 92406 to the nearest thousand.
  4. 4.Which is closest to 503 + 502 + 296? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  5. 5.Round 87705 to the nearest hundred.
  6. 6.Which is closest to 798 + 895 + 496? (a) 2100 (b) 2300 (c) 2400 (d) 2200
  7. 7.Round 82062 to the nearest hundred.
  8. 8.Which is closest to 802 + 595 + 702? (a) 2000 (b) 2200 (c) 2100 (d) 2300
  9. 9.Which is closest to 900 × 82? (Round each number first.) (a) 72000 (b) 720000 (c) 7200 (d) 144000
  10. 10.Which is closest to 197 × 42? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  11. 11.Which is closest to 304 × 68? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
  12. 12.Which is closest to 303 × 40? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  13. 13.Which is closest to 798 × 59? (Round each number first.) (a) 96000 (b) 4800 (c) 48000 (d) 480000
  14. 14.Which is closest to 1495 ÷ 49? (a) 30 (b) 15 (c) 60 (d) 300
  15. 15.Round 52.16 to one decimal place. =
  16. 16.Which is closest to 696 × 52? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  17. 17.Round 2677 to the nearest hundred.
  18. 18.Which is closest to 596 + 899 + 103? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  19. 19.Which is closest to 196 × 72? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  20. 20.Round 69.83 to one decimal place. =
  21. 21.Which is closest to 700 × 48? (Round each number first.) (a) 35000 (b) 3500 (c) 70000 (d) 350000
  22. 22.Round 67929 to the nearest ten.
  23. 23.Which is closest to 298 × 31? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000
  24. 24.Which is closest to 603 × 19? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  25. 25.Round 18.14 to one decimal place. =
  26. 26.Which is closest to 1796 ÷ 19? (a) 180 (b) 900 (c) 90 (d) 45
  27. 27.Which is closest to 1004 ÷ 21? (a) 500 (b) 25 (c) 100 (d) 50
  28. 28.Which is closest to 204 × 88? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  29. 29.Which is closest to 906 ÷ 31? (a) 30 (b) 15 (c) 60 (d) 300
  30. 30.Round 31580 to the nearest thousand.
  31. 31.Round 65521 to the nearest ten.
  32. 32.Which is closest to 803 × 52? (Round each number first.) (a) 4000 (b) 80000 (c) 400000 (d) 40000
  33. 33.Round 90.06 to one decimal place. =
  34. 34.Which is closest to 796 + 605 + 603? (a) 2100 (b) 2000 (c) 2200 (d) 1900
  35. 35.Which is closest to 1797 ÷ 31? (a) 30 (b) 120 (c) 60 (d) 600
  36. 36.Round 51393 to the nearest hundred.
  37. 37.Round 36.33 to one decimal place. =
  38. 38.Which is closest to 2096 ÷ 31? (a) 140 (b) 70 (c) 35 (d) 700
  39. 39.Which is closest to 197 × 78? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  40. 40.Round 89.27 to one decimal place. =

Answer key

  1. 60160
  2. 800
  3. 92000
  4. 1300
  5. 87700
  6. 2200
  7. 82100
  8. 2100
  9. 72000
  10. 8000
  11. 21000
  12. 12000
  13. 48000
  14. 30
  15. 52.2
  16. 35000
  17. 2700
  18. 1600
  19. 14000
  20. 69.8
  21. 35000
  22. 67930
  23. 9000
  24. 12000
  25. 18.1
  26. 90
  27. 50
  28. 18000
  29. 30
  30. 32000
  31. 65520
  32. 40000
  33. 90.1
  34. 2000
  35. 60
  36. 51400
  37. 36.3
  38. 70
  39. 16000
  40. 89.3

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