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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 854 · 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 17.29 to one decimal place. =
  2. 2.Which is closest to 1595 ÷ 19? (a) 800 (b) 80 (c) 160 (d) 40
  3. 3.Which is closest to 95 + 399 + 297? (a) 800 (b) 900 (c) 700 (d) 1000
  4. 4.Round 76.21 to one decimal place. =
  5. 5.Which is closest to 502 × 41? (Round each number first.) (a) 40000 (b) 200000 (c) 20000 (d) 2000
  6. 6.Round 1259 to the nearest thousand.
  7. 7.Which is closest to 403 × 38? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
  8. 8.Round 66.73 to one decimal place. =
  9. 9.Which is closest to 601 ÷ 19? (a) 15 (b) 60 (c) 30 (d) 300
  10. 10.Which is closest to 591 ÷ 21? (a) 300 (b) 15 (c) 60 (d) 30
  11. 11.Round 29893 to the nearest ten.
  12. 12.Which is closest to 296 + 904 + 805? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  13. 13.Which is closest to 203 × 18? (Round each number first.) (a) 400 (b) 8000 (c) 4000 (d) 40000
  14. 14.Round 16.73 to one decimal place. =
  15. 15.Round 11102 to the nearest thousand.
  16. 16.Which is closest to 602 × 71? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  17. 17.Which is closest to 903 × 28? (Round each number first.) (a) 54000 (b) 2700 (c) 270000 (d) 27000
  18. 18.Which is closest to 796 × 59? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  19. 19.Which is closest to 196 × 52? (Round each number first.) (a) 100000 (b) 10000 (c) 1000 (d) 20000
  20. 20.Which is closest to 2103 ÷ 31? (a) 35 (b) 140 (c) 700 (d) 70
  21. 21.Round 39759 to the nearest thousand.
  22. 22.Round 64.78 to one decimal place. =
  23. 23.Which is closest to 700 × 81? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  24. 24.Round 76.29 to one decimal place. =
  25. 25.Which is closest to 300 × 68? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  26. 26.Round 23.09 to one decimal place. =
  27. 27.Which is closest to 795 + 203 + 899? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  28. 28.Which is closest to 699 × 38? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  29. 29.Round 9023 to the nearest ten.
  30. 30.Round 8599 to the nearest hundred.
  31. 31.Round 26.22 to one decimal place. =
  32. 32.Which is closest to 601 × 39? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  33. 33.Which is closest to 698 × 50? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  34. 34.Round 48.33 to one decimal place. =
  35. 35.Round 87759 to the nearest thousand.
  36. 36.Which is closest to 805 + 603 + 899? (a) 2400 (b) 2300 (c) 2500 (d) 2200
  37. 37.Which is closest to 1493 ÷ 51? (a) 30 (b) 300 (c) 15 (d) 60
  38. 38.Round 31.16 to one decimal place. =
  39. 39.Which is closest to 402 + 205 + 400? (a) 1000 (b) 1200 (c) 900 (d) 1100
  40. 40.Round 69.92 to one decimal place. =

Answer key

  1. 17.3
  2. 80
  3. 800
  4. 76.2
  5. 20000
  6. 1000
  7. 16000
  8. 66.7
  9. 30
  10. 30
  11. 29890
  12. 2000
  13. 4000
  14. 16.7
  15. 11000
  16. 42000
  17. 27000
  18. 48000
  19. 10000
  20. 70
  21. 40000
  22. 64.8
  23. 56000
  24. 76.3
  25. 21000
  26. 23.1
  27. 1900
  28. 28000
  29. 9020
  30. 8600
  31. 26.2
  32. 24000
  33. 35000
  34. 48.3
  35. 88000
  36. 2300
  37. 30
  38. 31.2
  39. 1000
  40. 69.9

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