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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 186 · 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 48.26 to one decimal place. =
  2. 2.Round 85716 to the nearest thousand.
  3. 3.Which is closest to 497 × 52? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  4. 4.Round 26844 to the nearest ten.
  5. 5.Which is closest to 200 + 300 + 405? (a) 900 (b) 1000 (c) 1100 (d) 800
  6. 6.Round 78176 to the nearest ten.
  7. 7.Round 30745 to the nearest hundred.
  8. 8.Which is closest to 602 + 597 + 198? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  9. 9.Which is closest to 2499 ÷ 49? (a) 50 (b) 500 (c) 25 (d) 100
  10. 10.Which is closest to 1808 ÷ 21? (a) 90 (b) 45 (c) 180 (d) 900
  11. 11.Round 25262 to the nearest thousand.
  12. 12.Which is closest to 591 ÷ 31? (a) 10 (b) 200 (c) 20 (d) 40
  13. 13.Which is closest to 1196 ÷ 19? (a) 30 (b) 120 (c) 60 (d) 600
  14. 14.Round 6399 to the nearest ten.
  15. 15.Which is closest to 796 + 302 + 205? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  16. 16.Round 96007 to the nearest hundred.
  17. 17.Which is closest to 298 + 895 + 201? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  18. 18.Which is closest to 900 + 599 + 205? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  19. 19.Which is closest to 498 × 72? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  20. 20.Which is closest to 105 + 902 + 795? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  21. 21.Which is closest to 896 × 19? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  22. 22.Which is closest to 3497 ÷ 49? (a) 700 (b) 140 (c) 35 (d) 70
  23. 23.Which is closest to 2503 ÷ 49? (a) 100 (b) 500 (c) 25 (d) 50
  24. 24.Which is closest to 905 + 202 + 801? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  25. 25.Which is closest to 2792 ÷ 41? (a) 35 (b) 700 (c) 70 (d) 140
  26. 26.Which is closest to 98 + 201 + 695? (a) 900 (b) 1200 (c) 1000 (d) 1100
  27. 27.Which is closest to 1195 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  28. 28.Round 17.08 to one decimal place. =
  29. 29.Round 25974 to the nearest ten.
  30. 30.Round 27.62 to one decimal place. =
  31. 31.Round 47687 to the nearest thousand.
  32. 32.Which is closest to 199 × 18? (Round each number first.) (a) 8000 (b) 40000 (c) 400 (d) 4000
  33. 33.Which is closest to 302 × 49? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  34. 34.Which is closest to 496 × 71? (Round each number first.) (a) 3500 (b) 35000 (c) 70000 (d) 350000
  35. 35.Which is closest to 202 × 88? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  36. 36.Round 14266 to the nearest hundred.
  37. 37.Which is closest to 502 × 41? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  38. 38.Round 24.46 to one decimal place. =
  39. 39.Round 33181 to the nearest thousand.
  40. 40.Round 67.87 to one decimal place. =

Answer key

  1. 48.3
  2. 86000
  3. 25000
  4. 26840
  5. 900
  6. 78180
  7. 30700
  8. 1400
  9. 50
  10. 90
  11. 25000
  12. 20
  13. 60
  14. 6400
  15. 1300
  16. 96000
  17. 1400
  18. 1700
  19. 35000
  20. 1800
  21. 18000
  22. 70
  23. 50
  24. 1900
  25. 70
  26. 1000
  27. 60
  28. 17.1
  29. 25970
  30. 27.6
  31. 48000
  32. 4000
  33. 15000
  34. 35000
  35. 18000
  36. 14300
  37. 20000
  38. 24.5
  39. 33000
  40. 67.9

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