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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 98 · 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 27.37 to one decimal place. =
  2. 2.Which is closest to 804 × 21? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  3. 3.Round 55198 to the nearest hundred.
  4. 4.Which is closest to 799 × 49? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000
  5. 5.Which is closest to 499 + 496 + 595? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  6. 6.Which is closest to 896 × 18? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  7. 7.Which is closest to 904 + 302 + 301? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  8. 8.Round 54714 to the nearest ten.
  9. 9.Round 54992 to the nearest thousand.
  10. 10.Round 23734 to the nearest thousand.
  11. 11.Which is closest to 799 × 91? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  12. 12.Which is closest to 202 × 31? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  13. 13.Round 41293 to the nearest thousand.
  14. 14.Round 44.67 to one decimal place. =
  15. 15.Round 28.46 to one decimal place. =
  16. 16.Which is closest to 1994 ÷ 51? (a) 40 (b) 400 (c) 80 (d) 20
  17. 17.Round 78.83 to one decimal place. =
  18. 18.Which is closest to 803 ÷ 19? (a) 80 (b) 40 (c) 20 (d) 400
  19. 19.Round 28.92 to one decimal place. =
  20. 20.Which is closest to 697 + 902 + 701? (a) 2400 (b) 2500 (c) 2200 (d) 2300
  21. 21.Which is closest to 401 × 39? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  22. 22.Round 53.64 to one decimal place. =
  23. 23.Which is closest to 502 × 40? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  24. 24.Which is closest to 500 + 398 + 698? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  25. 25.Round 91578 to the nearest hundred.
  26. 26.Which is closest to 605 + 295 + 805? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  27. 27.Which is closest to 204 + 98 + 296? (a) 600 (b) 800 (c) 500 (d) 700
  28. 28.Which is closest to 1799 ÷ 31? (a) 600 (b) 30 (c) 60 (d) 120
  29. 29.Which is closest to 600 × 59? (Round each number first.) (a) 36000 (b) 72000 (c) 360000 (d) 3600
  30. 30.Round 61443 to the nearest ten.
  31. 31.Which is closest to 102 + 797 + 195? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  32. 32.Which is closest to 197 × 61? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  33. 33.Which is closest to 1196 ÷ 39? (a) 60 (b) 30 (c) 300 (d) 15
  34. 34.Which is closest to 497 + 700 + 204? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  35. 35.Which is closest to 1192 ÷ 21? (a) 600 (b) 120 (c) 30 (d) 60
  36. 36.Round 10.94 to one decimal place. =
  37. 37.Round 62.06 to one decimal place. =
  38. 38.Round 30.41 to one decimal place. =
  39. 39.Which is closest to 103 + 297 + 897? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  40. 40.Round 28.14 to one decimal place. =

Answer key

  1. 27.4
  2. 16000
  3. 55200
  4. 40000
  5. 1600
  6. 18000
  7. 1500
  8. 54710
  9. 55000
  10. 24000
  11. 72000
  12. 6000
  13. 41000
  14. 44.7
  15. 28.5
  16. 40
  17. 78.8
  18. 40
  19. 28.9
  20. 2300
  21. 16000
  22. 53.6
  23. 20000
  24. 1600
  25. 91600
  26. 1700
  27. 600
  28. 60
  29. 36000
  30. 61440
  31. 1100
  32. 12000
  33. 30
  34. 1400
  35. 60
  36. 10.9
  37. 62.1
  38. 30.4
  39. 1300
  40. 28.1

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