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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 716 · 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 19031 to the nearest ten.
  2. 2.Which is closest to 995 ÷ 49? (a) 200 (b) 10 (c) 40 (d) 20
  3. 3.Which is closest to 797 + 105 + 398? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  4. 4.Which is closest to 1996 ÷ 51? (a) 80 (b) 400 (c) 20 (d) 40
  5. 5.Which is closest to 1609 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  6. 6.Round 70086 to the nearest hundred.
  7. 7.Which is closest to 403 × 22? (Round each number first.) (a) 80000 (b) 8000 (c) 800 (d) 16000
  8. 8.Round 36844 to the nearest ten.
  9. 9.Round 51.13 to one decimal place. =
  10. 10.Round 28.19 to one decimal place. =
  11. 11.Which is closest to 697 + 196 + 199? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  12. 12.Round 90019 to the nearest ten.
  13. 13.Which is closest to 301 × 18? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  14. 14.Which is closest to 804 ÷ 19? (a) 40 (b) 400 (c) 80 (d) 20
  15. 15.Which is closest to 2808 ÷ 41? (a) 35 (b) 140 (c) 70 (d) 700
  16. 16.Which is closest to 202 × 72? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  17. 17.Round 16.72 to one decimal place. =
  18. 18.Round 69.12 to one decimal place. =
  19. 19.Which is closest to 1508 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300
  20. 20.Which is closest to 202 × 91? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  21. 21.Round 72.09 to one decimal place. =
  22. 22.Round 17992 to the nearest thousand.
  23. 23.Which is closest to 3203 ÷ 39? (a) 160 (b) 800 (c) 80 (d) 40
  24. 24.Round 65923 to the nearest hundred.
  25. 25.Round 97.69 to one decimal place. =
  26. 26.Which is closest to 602 ÷ 29? (a) 20 (b) 200 (c) 40 (d) 10
  27. 27.Which is closest to 201 × 78? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  28. 28.Round 58514 to the nearest ten.
  29. 29.Round 39.12 to one decimal place. =
  30. 30.Which is closest to 303 × 82? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  31. 31.Which is closest to 203 × 62? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  32. 32.Which is closest to 800 × 69? (Round each number first.) (a) 56000 (b) 560000 (c) 112000 (d) 5600
  33. 33.Round 38503 to the nearest ten.
  34. 34.Which is closest to 704 × 72? (Round each number first.) (a) 49000 (b) 98000 (c) 490000 (d) 4900
  35. 35.Which is closest to 297 × 32? (Round each number first.) (a) 90000 (b) 9000 (c) 900 (d) 18000
  36. 36.Which is closest to 800 + 803 + 301? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  37. 37.Which is closest to 699 + 604 + 200? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  38. 38.Which is closest to 703 × 90? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
  39. 39.Round 69.07 to one decimal place. =
  40. 40.Which is closest to 3000 ÷ 49? (a) 30 (b) 120 (c) 60 (d) 600

Answer key

  1. 19030
  2. 20
  3. 1300
  4. 40
  5. 40
  6. 70100
  7. 8000
  8. 36840
  9. 51.1
  10. 28.2
  11. 1100
  12. 90020
  13. 6000
  14. 40
  15. 70
  16. 14000
  17. 16.7
  18. 69.1
  19. 30
  20. 18000
  21. 72.1
  22. 18000
  23. 80
  24. 65900
  25. 97.7
  26. 20
  27. 16000
  28. 58510
  29. 39.1
  30. 24000
  31. 12000
  32. 56000
  33. 38500
  34. 49000
  35. 9000
  36. 1900
  37. 1500
  38. 63000
  39. 69.1
  40. 60

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