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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 428 · 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 35473 to the nearest thousand.
  2. 2.Which is closest to 501 × 38? (Round each number first.) (a) 200000 (b) 40000 (c) 20000 (d) 2000
  3. 3.Round 54098 to the nearest thousand.
  4. 4.Which is closest to 300 × 21? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  5. 5.Which is closest to 2397 ÷ 29? (a) 40 (b) 800 (c) 80 (d) 160
  6. 6.Round 92489 to the nearest thousand.
  7. 7.Which is closest to 2397 ÷ 41? (a) 120 (b) 60 (c) 600 (d) 30
  8. 8.Round 67393 to the nearest hundred.
  9. 9.Round 84450 to the nearest thousand.
  10. 10.Which is closest to 696 + 503 + 199? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  11. 11.Round 21687 to the nearest hundred.
  12. 12.Which is closest to 2806 ÷ 41? (a) 140 (b) 70 (c) 700 (d) 35
  13. 13.Round 2869 to the nearest hundred.
  14. 14.Which is closest to 3207 ÷ 39? (a) 160 (b) 80 (c) 800 (d) 40
  15. 15.Round 60.24 to one decimal place. =
  16. 16.Which is closest to 696 × 92? (Round each number first.) (a) 630000 (b) 126000 (c) 6300 (d) 63000
  17. 17.Which is closest to 797 × 61? (Round each number first.) (a) 96000 (b) 48000 (c) 480000 (d) 4800
  18. 18.Round 16.28 to one decimal place. =
  19. 19.Round 20772 to the nearest hundred.
  20. 20.Round 61.29 to one decimal place. =
  21. 21.Round 81.69 to one decimal place. =
  22. 22.Round 12017 to the nearest hundred.
  23. 23.Round 21849 to the nearest thousand.
  24. 24.Which is closest to 1999 ÷ 51? (a) 40 (b) 20 (c) 80 (d) 400
  25. 25.Round 69.14 to one decimal place. =
  26. 26.Which is closest to 601 + 597 + 895? (a) 2200 (b) 2100 (c) 2300 (d) 2000
  27. 27.Which is closest to 2404 ÷ 29? (a) 40 (b) 800 (c) 80 (d) 160
  28. 28.Which is closest to 502 × 38? (Round each number first.) (a) 40000 (b) 2000 (c) 200000 (d) 20000
  29. 29.Round 82341 to the nearest thousand.
  30. 30.Round 36.71 to one decimal place. =
  31. 31.Round 43367 to the nearest ten.
  32. 32.Which is closest to 703 × 21? (Round each number first.) (a) 28000 (b) 14000 (c) 1400 (d) 140000
  33. 33.Which is closest to 300 × 38? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  34. 34.Round 73754 to the nearest ten.
  35. 35.Round 16.71 to one decimal place. =
  36. 36.Which is closest to 502 + 495 + 95? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  37. 37.Which is closest to 297 × 20? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  38. 38.Which is closest to 1203 ÷ 21? (a) 30 (b) 600 (c) 120 (d) 60
  39. 39.Which is closest to 1800 ÷ 21? (a) 90 (b) 900 (c) 180 (d) 45
  40. 40.Which is closest to 501 + 296 + 495? (a) 1400 (b) 1500 (c) 1300 (d) 1200

Answer key

  1. 35000
  2. 20000
  3. 54000
  4. 6000
  5. 80
  6. 92000
  7. 60
  8. 67400
  9. 84000
  10. 1400
  11. 21700
  12. 70
  13. 2900
  14. 80
  15. 60.2
  16. 63000
  17. 48000
  18. 16.3
  19. 20800
  20. 61.3
  21. 81.7
  22. 12000
  23. 22000
  24. 40
  25. 69.1
  26. 2100
  27. 80
  28. 20000
  29. 82000
  30. 36.7
  31. 43370
  32. 14000
  33. 12000
  34. 73750
  35. 16.7
  36. 1100
  37. 6000
  38. 60
  39. 90
  40. 1300

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