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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 342 · 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 697 × 88? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  2. 2.Round 82237 to the nearest ten.
  3. 3.Which is closest to 1605 ÷ 19? (a) 800 (b) 40 (c) 80 (d) 160
  4. 4.Which is closest to 198 + 101 + 297? (a) 500 (b) 600 (c) 700 (d) 800
  5. 5.Round 41504 to the nearest ten.
  6. 6.Which is closest to 4494 ÷ 49? (a) 45 (b) 90 (c) 180 (d) 900
  7. 7.Which is closest to 1195 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  8. 8.Which is closest to 697 × 39? (Round each number first.) (a) 280000 (b) 28000 (c) 56000 (d) 2800
  9. 9.Which is closest to 298 × 51? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  10. 10.Which is closest to 401 × 49? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  11. 11.Round 27.79 to one decimal place. =
  12. 12.Round 25.17 to one decimal place. =
  13. 13.Round 3033 to the nearest hundred.
  14. 14.Round 84.93 to one decimal place. =
  15. 15.Which is closest to 798 + 298 + 403? (a) 1500 (b) 1400 (c) 1600 (d) 1700
  16. 16.Which is closest to 1793 ÷ 29? (a) 600 (b) 60 (c) 30 (d) 120
  17. 17.Which is closest to 3606 ÷ 39? (a) 90 (b) 45 (c) 180 (d) 900
  18. 18.Round 38.12 to one decimal place. =
  19. 19.Which is closest to 499 + 900 + 95? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  20. 20.Round 31.47 to one decimal place. =
  21. 21.Which is closest to 1999 ÷ 39? (a) 25 (b) 500 (c) 100 (d) 50
  22. 22.Round 66269 to the nearest hundred.
  23. 23.Round 25601 to the nearest ten.
  24. 24.Which is closest to 799 + 105 + 201? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  25. 25.Which is closest to 4504 ÷ 49? (a) 90 (b) 45 (c) 900 (d) 180
  26. 26.Which is closest to 395 + 600 + 901? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  27. 27.Which is closest to 795 + 497 + 599? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  28. 28.Which is closest to 202 + 497 + 499? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  29. 29.Which is closest to 1206 ÷ 31? (a) 400 (b) 80 (c) 40 (d) 20
  30. 30.Which is closest to 401 × 89? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  31. 31.Which is closest to 697 × 71? (Round each number first.) (a) 98000 (b) 490000 (c) 49000 (d) 4900
  32. 32.Which is closest to 398 × 32? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  33. 33.Round 62867 to the nearest hundred.
  34. 34.Which is closest to 96 + 301 + 595? (a) 1100 (b) 1200 (c) 900 (d) 1000
  35. 35.Round 17876 to the nearest hundred.
  36. 36.Which is closest to 600 × 69? (Round each number first.) (a) 4200 (b) 84000 (c) 420000 (d) 42000
  37. 37.Which is closest to 2702 ÷ 29? (a) 900 (b) 180 (c) 45 (d) 90
  38. 38.Which is closest to 1192 ÷ 41? (a) 60 (b) 300 (c) 30 (d) 15
  39. 39.Which is closest to 1492 ÷ 49? (a) 300 (b) 30 (c) 15 (d) 60
  40. 40.Round 63.61 to one decimal place. =

Answer key

  1. 63000
  2. 82240
  3. 80
  4. 600
  5. 41500
  6. 90
  7. 60
  8. 28000
  9. 15000
  10. 20000
  11. 27.8
  12. 25.2
  13. 3000
  14. 84.9
  15. 1500
  16. 60
  17. 90
  18. 38.1
  19. 1500
  20. 31.5
  21. 50
  22. 66300
  23. 25600
  24. 1100
  25. 90
  26. 1900
  27. 1900
  28. 1200
  29. 40
  30. 36000
  31. 49000
  32. 12000
  33. 62900
  34. 1000
  35. 17900
  36. 42000
  37. 90
  38. 30
  39. 30
  40. 63.6

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