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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 884 · 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 26017 to the nearest ten.
  2. 2.Which is closest to 599 × 52? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  3. 3.Which is closest to 796 ÷ 39? (a) 20 (b) 40 (c) 10 (d) 200
  4. 4.Round 26358 to the nearest hundred.
  5. 5.Round 15328 to the nearest thousand.
  6. 6.Which is closest to 497 × 89? (Round each number first.) (a) 4500 (b) 450000 (c) 45000 (d) 90000
  7. 7.Which is closest to 798 + 304 + 605? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  8. 8.Round 47.64 to one decimal place. =
  9. 9.Which is closest to 500 + 598 + 300? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  10. 10.Round 91861 to the nearest thousand.
  11. 11.Round 58042 to the nearest hundred.
  12. 12.Which is closest to 896 + 802 + 303? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  13. 13.Which is closest to 396 + 95 + 398? (a) 1000 (b) 1100 (c) 800 (d) 900
  14. 14.Which is closest to 604 × 39? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  15. 15.Round 21573 to the nearest ten.
  16. 16.Round 43.54 to one decimal place. =
  17. 17.Which is closest to 1502 ÷ 49? (a) 300 (b) 15 (c) 60 (d) 30
  18. 18.Which is closest to 598 × 29? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  19. 19.Which is closest to 904 × 41? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  20. 20.Which is closest to 301 × 32? (Round each number first.) (a) 9000 (b) 18000 (c) 90000 (d) 900
  21. 21.Round 10608 to the nearest thousand.
  22. 22.Round 73203 to the nearest ten.
  23. 23.Which is closest to 801 × 19? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  24. 24.Round 61.33 to one decimal place. =
  25. 25.Which is closest to 202 + 300 + 103? (a) 500 (b) 700 (c) 800 (d) 600
  26. 26.Which is closest to 203 × 91? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  27. 27.Which is closest to 802 × 32? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  28. 28.Which is closest to 301 × 39? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  29. 29.Which is closest to 397 ÷ 21? (a) 200 (b) 10 (c) 40 (d) 20
  30. 30.Which is closest to 299 × 90? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  31. 31.Which is closest to 604 × 18? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  32. 32.Which is closest to 901 + 104 + 400? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  33. 33.Which is closest to 1505 ÷ 29? (a) 25 (b) 50 (c) 100 (d) 500
  34. 34.Which is closest to 105 + 296 + 405? (a) 1000 (b) 900 (c) 700 (d) 800
  35. 35.Round 53886 to the nearest hundred.
  36. 36.Round 34.09 to one decimal place. =
  37. 37.Which is closest to 196 × 60? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  38. 38.Which is closest to 97 + 401 + 496? (a) 1100 (b) 1000 (c) 900 (d) 1200
  39. 39.Which is closest to 1996 ÷ 51? (a) 40 (b) 400 (c) 20 (d) 80
  40. 40.Which is closest to 1197 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600

Answer key

  1. 26020
  2. 30000
  3. 20
  4. 26400
  5. 15000
  6. 45000
  7. 1700
  8. 47.6
  9. 1400
  10. 92000
  11. 58000
  12. 2000
  13. 900
  14. 24000
  15. 21570
  16. 43.5
  17. 30
  18. 18000
  19. 36000
  20. 9000
  21. 11000
  22. 73200
  23. 16000
  24. 61.3
  25. 600
  26. 18000
  27. 24000
  28. 12000
  29. 20
  30. 27000
  31. 12000
  32. 1400
  33. 50
  34. 800
  35. 53900
  36. 34.1
  37. 12000
  38. 1000
  39. 40
  40. 60

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