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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 119 · 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 295 + 804 + 195? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  2. 2.Which is closest to 3004 ÷ 49? (a) 60 (b) 600 (c) 30 (d) 120
  3. 3.Round 72.71 to one decimal place. =
  4. 4.Round 14971 to the nearest ten.
  5. 5.Round 21337 to the nearest ten.
  6. 6.Round 50.24 to one decimal place. =
  7. 7.Which is closest to 1602 ÷ 21? (a) 160 (b) 40 (c) 800 (d) 80
  8. 8.Round 78.09 to one decimal place. =
  9. 9.Which is closest to 599 + 303 + 705? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  10. 10.Round 61290 to the nearest hundred.
  11. 11.Round 60.68 to one decimal place. =
  12. 12.Which is closest to 195 + 595 + 204? (a) 1000 (b) 1100 (c) 1200 (d) 900
  13. 13.Round 27596 to the nearest hundred.
  14. 14.Which is closest to 498 × 21? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
  15. 15.Round 52613 to the nearest hundred.
  16. 16.Which is closest to 298 × 30? (Round each number first.) (a) 900 (b) 18000 (c) 90000 (d) 9000
  17. 17.Which is closest to 303 × 68? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  18. 18.Which is closest to 1407 ÷ 19? (a) 35 (b) 700 (c) 70 (d) 140
  19. 19.Which is closest to 196 × 51? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  20. 20.Round 57610 to the nearest thousand.
  21. 21.Round 85.31 to one decimal place. =
  22. 22.Which is closest to 1400 ÷ 21? (a) 35 (b) 700 (c) 140 (d) 70
  23. 23.Which is closest to 398 ÷ 21? (a) 200 (b) 40 (c) 20 (d) 10
  24. 24.Round 96121 to the nearest thousand.
  25. 25.Round 62541 to the nearest ten.
  26. 26.Which is closest to 2491 ÷ 49? (a) 500 (b) 100 (c) 50 (d) 25
  27. 27.Round 24084 to the nearest hundred.
  28. 28.Which is closest to 794 ÷ 39? (a) 200 (b) 20 (c) 40 (d) 10
  29. 29.Which is closest to 203 + 98 + 95? (a) 600 (b) 500 (c) 400 (d) 300
  30. 30.Which is closest to 204 × 59? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  31. 31.Round 8790 to the nearest hundred.
  32. 32.Which is closest to 698 × 18? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  33. 33.Round 34072 to the nearest hundred.
  34. 34.Which is closest to 1205 ÷ 41? (a) 15 (b) 30 (c) 300 (d) 60
  35. 35.Round 60009 to the nearest ten.
  36. 36.Which is closest to 904 + 804 + 100? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  37. 37.Which is closest to 801 + 403 + 203? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  38. 38.Round 28.29 to one decimal place. =
  39. 39.Which is closest to 596 × 91? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  40. 40.Round 58.32 to one decimal place. =

Answer key

  1. 1300
  2. 60
  3. 72.7
  4. 14970
  5. 21340
  6. 50.2
  7. 80
  8. 78.1
  9. 1600
  10. 61300
  11. 60.7
  12. 1000
  13. 27600
  14. 10000
  15. 52600
  16. 9000
  17. 21000
  18. 70
  19. 10000
  20. 58000
  21. 85.3
  22. 70
  23. 20
  24. 96000
  25. 62540
  26. 50
  27. 24100
  28. 20
  29. 400
  30. 12000
  31. 8800
  32. 14000
  33. 34100
  34. 30
  35. 60010
  36. 1800
  37. 1400
  38. 28.3
  39. 54000
  40. 58.3

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