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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 812 · 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 502 × 32? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  2. 2.Which is closest to 697 × 38? (Round each number first.) (a) 280000 (b) 56000 (c) 28000 (d) 2800
  3. 3.Which is closest to 3599 ÷ 39? (a) 900 (b) 180 (c) 90 (d) 45
  4. 4.Round 96664 to the nearest ten.
  5. 5.Round 6250 to the nearest thousand.
  6. 6.Round 22.42 to one decimal place. =
  7. 7.Which is closest to 199 × 62? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  8. 8.Round 44698 to the nearest thousand.
  9. 9.Round 99778 to the nearest ten.
  10. 10.Which is closest to 296 × 82? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  11. 11.Which is closest to 599 ÷ 19? (a) 30 (b) 300 (c) 15 (d) 60
  12. 12.Which is closest to 496 × 18? (Round each number first.) (a) 10000 (b) 20000 (c) 100000 (d) 1000
  13. 13.Which is closest to 399 × 18? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  14. 14.Round 22.87 to one decimal place. =
  15. 15.Round 21755 to the nearest hundred.
  16. 16.Round 24.52 to one decimal place. =
  17. 17.Round 21439 to the nearest thousand.
  18. 18.Which is closest to 2005 ÷ 49? (a) 40 (b) 80 (c) 400 (d) 20
  19. 19.Which is closest to 597 + 105 + 499? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  20. 20.Round 85.69 to one decimal place. =
  21. 21.Round 39.42 to one decimal place. =
  22. 22.Round 28.32 to one decimal place. =
  23. 23.Which is closest to 295 + 399 + 501? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  24. 24.Which is closest to 1497 ÷ 49? (a) 60 (b) 15 (c) 300 (d) 30
  25. 25.Which is closest to 195 + 697 + 802? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  26. 26.Round 63466 to the nearest ten.
  27. 27.Round 18.23 to one decimal place. =
  28. 28.Round 36.23 to one decimal place. =
  29. 29.Which is closest to 301 + 298 + 505? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  30. 30.Round 23.38 to one decimal place. =
  31. 31.Which is closest to 196 + 401 + 304? (a) 900 (b) 1000 (c) 800 (d) 1100
  32. 32.Which is closest to 806 ÷ 41? (a) 40 (b) 10 (c) 20 (d) 200
  33. 33.Which is closest to 398 × 28? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  34. 34.Which is closest to 403 × 29? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  35. 35.Which is closest to 1501 ÷ 29? (a) 100 (b) 25 (c) 500 (d) 50
  36. 36.Which is closest to 396 × 19? (Round each number first.) (a) 8000 (b) 16000 (c) 800 (d) 80000
  37. 37.Which is closest to 603 + 704 + 296? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  38. 38.Round 50.18 to one decimal place. =
  39. 39.Round 61.93 to one decimal place. =
  40. 40.Which is closest to 700 + 899 + 704? (a) 2300 (b) 2500 (c) 2200 (d) 2400

Answer key

  1. 15000
  2. 28000
  3. 90
  4. 96660
  5. 6000
  6. 22.4
  7. 12000
  8. 45000
  9. 99780
  10. 24000
  11. 30
  12. 10000
  13. 8000
  14. 22.9
  15. 21800
  16. 24.5
  17. 21000
  18. 40
  19. 1200
  20. 85.7
  21. 39.4
  22. 28.3
  23. 1200
  24. 30
  25. 1700
  26. 63470
  27. 18.2
  28. 36.2
  29. 1100
  30. 23.4
  31. 900
  32. 20
  33. 12000
  34. 12000
  35. 50
  36. 8000
  37. 1600
  38. 50.2
  39. 61.9
  40. 2300

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