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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 918 · 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 13.31 to one decimal place. =
  2. 2.Which is closest to 800 × 92? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  3. 3.Which is closest to 197 × 52? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  4. 4.Round 95628 to the nearest ten.
  5. 5.Round 65383 to the nearest ten.
  6. 6.Which is closest to 798 × 41? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  7. 7.Which is closest to 504 × 60? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  8. 8.Round 19.07 to one decimal place. =
  9. 9.Which is closest to 303 × 21? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  10. 10.Which is closest to 896 × 38? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  11. 11.Round 85.24 to one decimal place. =
  12. 12.Which is closest to 201 + 301 + 603? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  13. 13.Which is closest to 900 ÷ 31? (a) 30 (b) 300 (c) 60 (d) 15
  14. 14.Which is closest to 398 ÷ 21? (a) 40 (b) 200 (c) 10 (d) 20
  15. 15.Round 59662 to the nearest hundred.
  16. 16.Which is closest to 903 ÷ 29? (a) 30 (b) 300 (c) 15 (d) 60
  17. 17.Which is closest to 992 ÷ 21? (a) 100 (b) 500 (c) 25 (d) 50
  18. 18.Which is closest to 201 × 39? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  19. 19.Which is closest to 898 + 703 + 200? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  20. 20.Which is closest to 1396 ÷ 19? (a) 70 (b) 140 (c) 35 (d) 700
  21. 21.Round 35511 to the nearest ten.
  22. 22.Which is closest to 396 ÷ 21? (a) 20 (b) 200 (c) 10 (d) 40
  23. 23.Which is closest to 3602 ÷ 39? (a) 90 (b) 45 (c) 900 (d) 180
  24. 24.Which is closest to 898 + 303 + 895? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  25. 25.Round 95844 to the nearest thousand.
  26. 26.Round 72753 to the nearest hundred.
  27. 27.Which is closest to 1503 ÷ 51? (a) 15 (b) 60 (c) 30 (d) 300
  28. 28.Which is closest to 205 + 205 + 897? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  29. 29.Which is closest to 1205 ÷ 39? (a) 15 (b) 300 (c) 60 (d) 30
  30. 30.Round 45902 to the nearest hundred.
  31. 31.Round 42274 to the nearest ten.
  32. 32.Which is closest to 2493 ÷ 49? (a) 25 (b) 500 (c) 100 (d) 50
  33. 33.Which is closest to 298 × 52? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
  34. 34.Round 90.41 to one decimal place. =
  35. 35.Which is closest to 401 × 78? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
  36. 36.Which is closest to 1497 ÷ 31? (a) 500 (b) 25 (c) 100 (d) 50
  37. 37.Which is closest to 897 × 39? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  38. 38.Which is closest to 203 × 81? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  39. 39.Which is closest to 903 × 61? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  40. 40.Round 33216 to the nearest ten.

Answer key

  1. 13.3
  2. 72000
  3. 10000
  4. 95630
  5. 65380
  6. 32000
  7. 30000
  8. 19.1
  9. 6000
  10. 36000
  11. 85.2
  12. 1100
  13. 30
  14. 20
  15. 59700
  16. 30
  17. 50
  18. 8000
  19. 1800
  20. 70
  21. 35510
  22. 20
  23. 90
  24. 2100
  25. 96000
  26. 72800
  27. 30
  28. 1300
  29. 30
  30. 45900
  31. 42270
  32. 50
  33. 15000
  34. 90.4
  35. 32000
  36. 50
  37. 36000
  38. 16000
  39. 54000
  40. 33220

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