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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 808 · 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 94.66 to one decimal place. =
  2. 2.Round 41638 to the nearest thousand.
  3. 3.Round 17502 to the nearest ten.
  4. 4.Which is closest to 1991 ÷ 41? (a) 100 (b) 50 (c) 500 (d) 25
  5. 5.Round 17.12 to one decimal place. =
  6. 6.Which is closest to 497 × 42? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  7. 7.Which is closest to 1503 ÷ 49? (a) 60 (b) 30 (c) 300 (d) 15
  8. 8.Which is closest to 701 + 597 + 400? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  9. 9.Which is closest to 800 × 18? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  10. 10.Which is closest to 199 + 602 + 203? (a) 1200 (b) 900 (c) 1100 (d) 1000
  11. 11.Which is closest to 396 + 799 + 197? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  12. 12.Which is closest to 992 ÷ 19? (a) 500 (b) 100 (c) 25 (d) 50
  13. 13.Which is closest to 502 + 902 + 700? (a) 2300 (b) 2200 (c) 2000 (d) 2100
  14. 14.Which is closest to 404 × 70? (Round each number first.) (a) 280000 (b) 28000 (c) 56000 (d) 2800
  15. 15.Which is closest to 900 × 81? (Round each number first.) (a) 144000 (b) 720000 (c) 72000 (d) 7200
  16. 16.Round 83035 to the nearest hundred.
  17. 17.Which is closest to 599 ÷ 29? (a) 20 (b) 10 (c) 40 (d) 200
  18. 18.Which is closest to 1609 ÷ 19? (a) 40 (b) 160 (c) 800 (d) 80
  19. 19.Which is closest to 804 × 81? (Round each number first.) (a) 6400 (b) 640000 (c) 128000 (d) 64000
  20. 20.Which is closest to 2405 ÷ 39? (a) 60 (b) 120 (c) 30 (d) 600
  21. 21.Round 79094 to the nearest thousand.
  22. 22.Which is closest to 396 × 22? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
  23. 23.Which is closest to 304 × 38? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  24. 24.Round 77427 to the nearest ten.
  25. 25.Round 11.08 to one decimal place. =
  26. 26.Round 98963 to the nearest hundred.
  27. 27.Which is closest to 297 × 68? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
  28. 28.Which is closest to 304 + 301 + 599? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  29. 29.Which is closest to 600 × 39? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  30. 30.Which is closest to 904 + 796 + 396? (a) 2100 (b) 2200 (c) 2300 (d) 2000
  31. 31.Round 42.94 to one decimal place. =
  32. 32.Round 95.06 to one decimal place. =
  33. 33.Round 42.73 to one decimal place. =
  34. 34.Which is closest to 197 × 61? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  35. 35.Which is closest to 1794 ÷ 29? (a) 600 (b) 30 (c) 120 (d) 60
  36. 36.Which is closest to 197 × 40? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  37. 37.Round 24098 to the nearest hundred.
  38. 38.Which is closest to 696 × 78? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
  39. 39.Which is closest to 504 × 78? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  40. 40.Which is closest to 403 × 50? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000

Answer key

  1. 94.7
  2. 42000
  3. 17500
  4. 50
  5. 17.1
  6. 20000
  7. 30
  8. 1700
  9. 16000
  10. 1000
  11. 1400
  12. 50
  13. 2100
  14. 28000
  15. 72000
  16. 83000
  17. 20
  18. 80
  19. 64000
  20. 60
  21. 79000
  22. 8000
  23. 12000
  24. 77430
  25. 11.1
  26. 99000
  27. 21000
  28. 1200
  29. 24000
  30. 2100
  31. 42.9
  32. 95.1
  33. 42.7
  34. 12000
  35. 60
  36. 8000
  37. 24100
  38. 56000
  39. 40000
  40. 20000

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