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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 285 · 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 599 + 495 + 805? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  2. 2.Round 19.88 to one decimal place. =
  3. 3.Which is closest to 297 × 68? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  4. 4.Which is closest to 395 + 504 + 198? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  5. 5.Round 44.53 to one decimal place. =
  6. 6.Round 19.32 to one decimal place. =
  7. 7.Round 37170 to the nearest thousand.
  8. 8.Which is closest to 403 × 48? (Round each number first.) (a) 20000 (b) 200000 (c) 2000 (d) 40000
  9. 9.Round 25.17 to one decimal place. =
  10. 10.Which is closest to 299 × 79? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  11. 11.Which is closest to 102 + 599 + 696? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  12. 12.Which is closest to 304 + 599 + 305? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  13. 13.Round 35.51 to one decimal place. =
  14. 14.Round 65.74 to one decimal place. =
  15. 15.Which is closest to 406 ÷ 21? (a) 20 (b) 10 (c) 40 (d) 200
  16. 16.Which is closest to 596 × 88? (Round each number first.) (a) 108000 (b) 54000 (c) 540000 (d) 5400
  17. 17.Round 53252 to the nearest hundred.
  18. 18.Round 43.77 to one decimal place. =
  19. 19.Round 58915 to the nearest hundred.
  20. 20.Round 33.39 to one decimal place. =
  21. 21.Round 61494 to the nearest thousand.
  22. 22.Round 66440 to the nearest thousand.
  23. 23.Round 97863 to the nearest ten.
  24. 24.Round 83.09 to one decimal place. =
  25. 25.Which is closest to 3004 ÷ 49? (a) 120 (b) 30 (c) 60 (d) 600
  26. 26.Which is closest to 302 × 40? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  27. 27.Round 69.66 to one decimal place. =
  28. 28.Which is closest to 1503 ÷ 51? (a) 30 (b) 300 (c) 15 (d) 60
  29. 29.Round 92.59 to one decimal place. =
  30. 30.Which is closest to 504 + 705 + 304? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  31. 31.Round 64306 to the nearest thousand.
  32. 32.Which is closest to 1206 ÷ 29? (a) 40 (b) 20 (c) 80 (d) 400
  33. 33.Round 64440 to the nearest hundred.
  34. 34.Round 59.06 to one decimal place. =
  35. 35.Round 29.59 to one decimal place. =
  36. 36.Which is closest to 296 + 598 + 700? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  37. 37.Which is closest to 99 + 202 + 295? (a) 800 (b) 600 (c) 700 (d) 500
  38. 38.Which is closest to 1200 ÷ 39? (a) 60 (b) 300 (c) 30 (d) 15
  39. 39.Which is closest to 904 × 48? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
  40. 40.Which is closest to 1006 ÷ 21? (a) 500 (b) 50 (c) 100 (d) 25

Answer key

  1. 1900
  2. 19.9
  3. 21000
  4. 1100
  5. 44.5
  6. 19.3
  7. 37000
  8. 20000
  9. 25.2
  10. 24000
  11. 1400
  12. 1200
  13. 35.5
  14. 65.7
  15. 20
  16. 54000
  17. 53300
  18. 43.8
  19. 58900
  20. 33.4
  21. 61000
  22. 66000
  23. 97860
  24. 83.1
  25. 60
  26. 12000
  27. 69.7
  28. 30
  29. 92.6
  30. 1500
  31. 64000
  32. 40
  33. 64400
  34. 59.1
  35. 29.6
  36. 1600
  37. 600
  38. 30
  39. 45000
  40. 50

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