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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 700 · 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 27385 to the nearest hundred.
  2. 2.Which is closest to 600 + 296 + 196? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  3. 3.Round 39439 to the nearest ten.
  4. 4.Round 28.84 to one decimal place. =
  5. 5.Round 97581 to the nearest hundred.
  6. 6.Which is closest to 896 × 21? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  7. 7.Which is closest to 297 × 69? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  8. 8.Which is closest to 905 + 95 + 296? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  9. 9.Which is closest to 1806 ÷ 31? (a) 120 (b) 60 (c) 30 (d) 600
  10. 10.Which is closest to 303 + 896 + 697? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  11. 11.Which is closest to 497 + 104 + 605? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  12. 12.Round 23587 to the nearest thousand.
  13. 13.Which is closest to 303 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  14. 14.Which is closest to 296 × 21? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  15. 15.Round 73220 to the nearest thousand.
  16. 16.Which is closest to 908 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30
  17. 17.Round 71.19 to one decimal place. =
  18. 18.Which is closest to 498 × 58? (Round each number first.) (a) 3000 (b) 300000 (c) 30000 (d) 60000
  19. 19.Which is closest to 304 × 89? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  20. 20.Round 11.24 to one decimal place. =
  21. 21.Round 80043 to the nearest hundred.
  22. 22.Which is closest to 300 + 499 + 704? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  23. 23.Which is closest to 896 × 91? (Round each number first.) (a) 810000 (b) 162000 (c) 81000 (d) 8100
  24. 24.Round 14.21 to one decimal place. =
  25. 25.Which is closest to 1795 ÷ 21? (a) 45 (b) 900 (c) 180 (d) 90
  26. 26.Which is closest to 599 ÷ 21? (a) 300 (b) 30 (c) 60 (d) 15
  27. 27.Which is closest to 699 × 29? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  28. 28.Which is closest to 995 ÷ 49? (a) 200 (b) 20 (c) 40 (d) 10
  29. 29.Round 90.24 to one decimal place. =
  30. 30.Round 77617 to the nearest ten.
  31. 31.Which is closest to 297 × 78? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  32. 32.Which is closest to 704 × 39? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  33. 33.Round 20113 to the nearest thousand.
  34. 34.Which is closest to 298 + 701 + 597? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  35. 35.Which is closest to 201 × 32? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  36. 36.Which is closest to 1205 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  37. 37.Round 21887 to the nearest thousand.
  38. 38.Round 34.92 to one decimal place. =
  39. 39.Round 9796 to the nearest thousand.
  40. 40.Round 26645 to the nearest thousand.

Answer key

  1. 27400
  2. 1100
  3. 39440
  4. 28.8
  5. 97600
  6. 18000
  7. 21000
  8. 1300
  9. 60
  10. 1900
  11. 1200
  12. 24000
  13. 6000
  14. 6000
  15. 73000
  16. 30
  17. 71.2
  18. 30000
  19. 27000
  20. 11.2
  21. 80000
  22. 1500
  23. 81000
  24. 14.2
  25. 90
  26. 30
  27. 21000
  28. 20
  29. 90.2
  30. 77620
  31. 24000
  32. 28000
  33. 20000
  34. 1600
  35. 6000
  36. 30
  37. 22000
  38. 34.9
  39. 10000
  40. 27000

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