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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 257 · 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 196 × 48? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
  2. 2.Which is closest to 2792 ÷ 39? (a) 700 (b) 35 (c) 140 (d) 70
  3. 3.Round 60.31 to one decimal place. =
  4. 4.Which is closest to 505 + 698 + 100? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  5. 5.Which is closest to 903 ÷ 31? (a) 15 (b) 300 (c) 60 (d) 30
  6. 6.Which is closest to 904 + 101 + 597? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  7. 7.Which is closest to 400 + 699 + 798? (a) 2100 (b) 2000 (c) 1900 (d) 1800
  8. 8.Round 61.44 to one decimal place. =
  9. 9.Round 69.83 to one decimal place. =
  10. 10.Which is closest to 97 + 298 + 796? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  11. 11.Round 14.81 to one decimal place. =
  12. 12.Round 63819 to the nearest hundred.
  13. 13.Which is closest to 96 + 295 + 604? (a) 900 (b) 1100 (c) 1000 (d) 1200
  14. 14.Which is closest to 899 + 296 + 900? (a) 2200 (b) 2100 (c) 2300 (d) 2000
  15. 15.Round 71307 to the nearest hundred.
  16. 16.Which is closest to 696 + 602 + 502? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  17. 17.Round 81.59 to one decimal place. =
  18. 18.Which is closest to 202 + 100 + 397? (a) 600 (b) 800 (c) 700 (d) 900
  19. 19.Which is closest to 397 × 42? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  20. 20.Which is closest to 995 ÷ 49? (a) 40 (b) 200 (c) 20 (d) 10
  21. 21.Round 37.51 to one decimal place. =
  22. 22.Round 87125 to the nearest thousand.
  23. 23.Round 54420 to the nearest hundred.
  24. 24.Round 59.54 to one decimal place. =
  25. 25.Which is closest to 601 × 68? (Round each number first.) (a) 84000 (b) 420000 (c) 4200 (d) 42000
  26. 26.Round 62.83 to one decimal place. =
  27. 27.Which is closest to 2406 ÷ 39? (a) 120 (b) 30 (c) 600 (d) 60
  28. 28.Which is closest to 596 + 196 + 603? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  29. 29.Which is closest to 1995 ÷ 51? (a) 80 (b) 400 (c) 20 (d) 40
  30. 30.Which is closest to 2801 ÷ 39? (a) 70 (b) 700 (c) 35 (d) 140
  31. 31.Which is closest to 1491 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300
  32. 32.Round 77.06 to one decimal place. =
  33. 33.Round 11449 to the nearest hundred.
  34. 34.Round 10.83 to one decimal place. =
  35. 35.Round 63494 to the nearest hundred.
  36. 36.Which is closest to 602 × 89? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  37. 37.Round 84603 to the nearest ten.
  38. 38.Which is closest to 2493 ÷ 51? (a) 100 (b) 25 (c) 500 (d) 50
  39. 39.Which is closest to 1001 ÷ 19? (a) 50 (b) 25 (c) 100 (d) 500
  40. 40.Round 78598 to the nearest hundred.

Answer key

  1. 10000
  2. 70
  3. 60.3
  4. 1300
  5. 30
  6. 1600
  7. 1900
  8. 61.4
  9. 69.8
  10. 1200
  11. 14.8
  12. 63800
  13. 1000
  14. 2100
  15. 71300
  16. 1800
  17. 81.6
  18. 700
  19. 16000
  20. 20
  21. 37.5
  22. 87000
  23. 54400
  24. 59.5
  25. 42000
  26. 62.8
  27. 60
  28. 1400
  29. 40
  30. 70
  31. 30
  32. 77.1
  33. 11400
  34. 10.8
  35. 63500
  36. 54000
  37. 84600
  38. 50
  39. 50
  40. 78600

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