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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 35 · 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 404 × 29? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  2. 2.Round 8237 to the nearest thousand.
  3. 3.Round 17852 to the nearest thousand.
  4. 4.Which is closest to 904 × 31? (Round each number first.) (a) 270000 (b) 54000 (c) 2700 (d) 27000
  5. 5.Which is closest to 1006 ÷ 51? (a) 40 (b) 10 (c) 200 (d) 20
  6. 6.Round 88380 to the nearest hundred.
  7. 7.Which is closest to 1801 ÷ 21? (a) 900 (b) 90 (c) 45 (d) 180
  8. 8.Which is closest to 503 × 31? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  9. 9.Which is closest to 2393 ÷ 39? (a) 600 (b) 30 (c) 120 (d) 60
  10. 10.Which is closest to 105 + 405 + 203? (a) 700 (b) 600 (c) 800 (d) 900
  11. 11.Which is closest to 1194 ÷ 29? (a) 20 (b) 400 (c) 40 (d) 80
  12. 12.Which is closest to 297 + 702 + 897? (a) 2100 (b) 1900 (c) 1800 (d) 2000
  13. 13.Which is closest to 597 × 32? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  14. 14.Which is closest to 399 + 202 + 203? (a) 800 (b) 700 (c) 900 (d) 1000
  15. 15.Round 83.63 to one decimal place. =
  16. 16.Which is closest to 497 + 301 + 195? (a) 1200 (b) 900 (c) 1000 (d) 1100
  17. 17.Round 12.57 to one decimal place. =
  18. 18.Which is closest to 804 × 40? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
  19. 19.Which is closest to 991 ÷ 21? (a) 500 (b) 25 (c) 50 (d) 100
  20. 20.Which is closest to 303 × 78? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  21. 21.Round 15.12 to one decimal place. =
  22. 22.Round 69.69 to one decimal place. =
  23. 23.Which is closest to 403 × 48? (Round each number first.) (a) 200000 (b) 20000 (c) 40000 (d) 2000
  24. 24.Round 72.33 to one decimal place. =
  25. 25.Which is closest to 505 + 605 + 899? (a) 2100 (b) 2000 (c) 2200 (d) 1900
  26. 26.Which is closest to 301 × 40? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  27. 27.Which is closest to 4493 ÷ 51? (a) 45 (b) 180 (c) 90 (d) 900
  28. 28.Which is closest to 100 + 103 + 500? (a) 900 (b) 800 (c) 600 (d) 700
  29. 29.Which is closest to 804 × 18? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
  30. 30.Which is closest to 902 × 68? (Round each number first.) (a) 63000 (b) 6300 (c) 126000 (d) 630000
  31. 31.Which is closest to 3009 ÷ 49? (a) 120 (b) 30 (c) 600 (d) 60
  32. 32.Round 23.27 to one decimal place. =
  33. 33.Which is closest to 1004 ÷ 19? (a) 25 (b) 100 (c) 500 (d) 50
  34. 34.Round 31304 to the nearest thousand.
  35. 35.Which is closest to 896 × 90? (Round each number first.) (a) 162000 (b) 81000 (c) 8100 (d) 810000
  36. 36.Which is closest to 702 × 78? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  37. 37.Which is closest to 2405 ÷ 41? (a) 600 (b) 30 (c) 60 (d) 120
  38. 38.Which is closest to 197 + 805 + 200? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  39. 39.Round 84641 to the nearest ten.
  40. 40.Which is closest to 601 + 604 + 205? (a) 1300 (b) 1500 (c) 1600 (d) 1400

Answer key

  1. 12000
  2. 8000
  3. 18000
  4. 27000
  5. 20
  6. 88400
  7. 90
  8. 15000
  9. 60
  10. 700
  11. 40
  12. 1900
  13. 18000
  14. 800
  15. 83.6
  16. 1000
  17. 12.6
  18. 32000
  19. 50
  20. 24000
  21. 15.1
  22. 69.7
  23. 20000
  24. 72.3
  25. 2000
  26. 12000
  27. 90
  28. 700
  29. 16000
  30. 63000
  31. 60
  32. 23.3
  33. 50
  34. 31000
  35. 81000
  36. 56000
  37. 60
  38. 1200
  39. 84640
  40. 1400

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