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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 704 · 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 76394 to the nearest ten.
  2. 2.Which is closest to 1192 ÷ 39? (a) 300 (b) 15 (c) 60 (d) 30
  3. 3.Which is closest to 701 + 899 + 301? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  4. 4.Which is closest to 200 × 58? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  5. 5.Which is closest to 598 × 88? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
  6. 6.Which is closest to 1003 ÷ 19? (a) 50 (b) 25 (c) 500 (d) 100
  7. 7.Round 60.06 to one decimal place. =
  8. 8.Which is closest to 602 × 49? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
  9. 9.Which is closest to 205 + 600 + 100? (a) 1100 (b) 900 (c) 1000 (d) 800
  10. 10.Round 47.09 to one decimal place. =
  11. 11.Round 35.68 to one decimal place. =
  12. 12.Which is closest to 999 ÷ 21? (a) 50 (b) 100 (c) 25 (d) 500
  13. 13.Which is closest to 397 + 599 + 803? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  14. 14.Round 78338 to the nearest thousand.
  15. 15.Which is closest to 795 + 101 + 305? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  16. 16.Which is closest to 1391 ÷ 21? (a) 140 (b) 70 (c) 700 (d) 35
  17. 17.Which is closest to 1999 ÷ 49? (a) 400 (b) 80 (c) 20 (d) 40
  18. 18.Which is closest to 1198 ÷ 29? (a) 40 (b) 20 (c) 80 (d) 400
  19. 19.Which is closest to 1603 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  20. 20.Round 46738 to the nearest ten.
  21. 21.Which is closest to 600 × 19? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  22. 22.Which is closest to 902 + 898 + 105? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  23. 23.Round 72.58 to one decimal place. =
  24. 24.Round 54.11 to one decimal place. =
  25. 25.Round 98489 to the nearest thousand.
  26. 26.Which is closest to 4505 ÷ 49? (a) 90 (b) 900 (c) 180 (d) 45
  27. 27.Which is closest to 399 × 49? (Round each number first.) (a) 200000 (b) 40000 (c) 20000 (d) 2000
  28. 28.Round 54154 to the nearest ten.
  29. 29.Round 32381 to the nearest ten.
  30. 30.Which is closest to 502 + 596 + 602? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  31. 31.Which is closest to 704 × 88? (Round each number first.) (a) 630000 (b) 63000 (c) 6300 (d) 126000
  32. 32.Round 33656 to the nearest ten.
  33. 33.Which is closest to 303 × 78? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  34. 34.Which is closest to 698 × 80? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  35. 35.Round 49.93 to one decimal place. =
  36. 36.Which is closest to 1201 ÷ 31? (a) 20 (b) 80 (c) 400 (d) 40
  37. 37.Which is closest to 404 + 99 + 897? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  38. 38.Which is closest to 500 × 59? (Round each number first.) (a) 30000 (b) 300000 (c) 3000 (d) 60000
  39. 39.Round 97.89 to one decimal place. =
  40. 40.Which is closest to 405 ÷ 19? (a) 20 (b) 200 (c) 10 (d) 40

Answer key

  1. 76390
  2. 30
  3. 1900
  4. 12000
  5. 54000
  6. 50
  7. 60.1
  8. 30000
  9. 900
  10. 47.1
  11. 35.7
  12. 50
  13. 1800
  14. 78000
  15. 1200
  16. 70
  17. 40
  18. 40
  19. 80
  20. 46740
  21. 12000
  22. 1900
  23. 72.6
  24. 54.1
  25. 98000
  26. 90
  27. 20000
  28. 54150
  29. 32380
  30. 1700
  31. 63000
  32. 33660
  33. 24000
  34. 56000
  35. 49.9
  36. 40
  37. 1400
  38. 30000
  39. 97.9
  40. 20

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