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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 893 · 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 72099 to the nearest ten.
  2. 2.Which is closest to 905 + 299 + 99? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  3. 3.Which is closest to 798 × 49? (Round each number first.) (a) 40000 (b) 80000 (c) 4000 (d) 400000
  4. 4.Round 30.31 to one decimal place. =
  5. 5.Round 35.76 to one decimal place. =
  6. 6.Round 41356 to the nearest hundred.
  7. 7.Round 72291 to the nearest thousand.
  8. 8.Round 37.82 to one decimal place. =
  9. 9.Round 27382 to the nearest ten.
  10. 10.Round 75219 to the nearest hundred.
  11. 11.Which is closest to 401 + 504 + 597? (a) 1500 (b) 1400 (c) 1600 (d) 1700
  12. 12.Which is closest to 798 + 704 + 95? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  13. 13.Which is closest to 699 × 19? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  14. 14.Which is closest to 802 × 21? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  15. 15.Which is closest to 896 + 902 + 895? (a) 2900 (b) 2700 (c) 2600 (d) 2800
  16. 16.Round 40266 to the nearest hundred.
  17. 17.Which is closest to 1200 ÷ 39? (a) 300 (b) 30 (c) 15 (d) 60
  18. 18.Which is closest to 901 × 71? (Round each number first.) (a) 63000 (b) 6300 (c) 630000 (d) 126000
  19. 19.Which is closest to 1597 ÷ 19? (a) 160 (b) 80 (c) 800 (d) 40
  20. 20.Round 16371 to the nearest thousand.
  21. 21.Which is closest to 396 × 51? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  22. 22.Which is closest to 2694 ÷ 31? (a) 45 (b) 90 (c) 180 (d) 900
  23. 23.Which is closest to 302 × 21? (Round each number first.) (a) 6000 (b) 12000 (c) 60000 (d) 600
  24. 24.Which is closest to 804 + 298 + 200? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  25. 25.Round 2648 to the nearest ten.
  26. 26.Which is closest to 397 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  27. 27.Which is closest to 2395 ÷ 39? (a) 120 (b) 30 (c) 60 (d) 600
  28. 28.Which is closest to 401 × 31? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  29. 29.Which is closest to 298 + 699 + 398? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  30. 30.Which is closest to 101 + 297 + 305? (a) 800 (b) 700 (c) 600 (d) 900
  31. 31.Which is closest to 701 × 58? (Round each number first.) (a) 84000 (b) 4200 (c) 420000 (d) 42000
  32. 32.Which is closest to 403 × 32? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  33. 33.Round 68767 to the nearest ten.
  34. 34.Round 29641 to the nearest ten.
  35. 35.Round 19898 to the nearest thousand.
  36. 36.Which is closest to 497 + 605 + 95? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  37. 37.Round 86.68 to one decimal place. =
  38. 38.Round 34.67 to one decimal place. =
  39. 39.Which is closest to 1496 ÷ 29? (a) 100 (b) 500 (c) 50 (d) 25
  40. 40.Which is closest to 401 × 60? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400

Answer key

  1. 72100
  2. 1300
  3. 40000
  4. 30.3
  5. 35.8
  6. 41400
  7. 72000
  8. 37.8
  9. 27380
  10. 75200
  11. 1500
  12. 1600
  13. 14000
  14. 16000
  15. 2700
  16. 40300
  17. 30
  18. 63000
  19. 80
  20. 16000
  21. 20000
  22. 90
  23. 6000
  24. 1300
  25. 2650
  26. 20
  27. 60
  28. 12000
  29. 1400
  30. 700
  31. 42000
  32. 12000
  33. 68770
  34. 29640
  35. 20000
  36. 1200
  37. 86.7
  38. 34.7
  39. 50
  40. 24000

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