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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 955 · 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 200 × 61? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  2. 2.Round 75.53 to one decimal place. =
  3. 3.Round 11223 to the nearest ten.
  4. 4.Which is closest to 205 + 297 + 403? (a) 1100 (b) 1000 (c) 900 (d) 800
  5. 5.Which is closest to 896 × 80? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  6. 6.Which is closest to 696 × 28? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  7. 7.Round 86813 to the nearest hundred.
  8. 8.Round 5305 to the nearest hundred.
  9. 9.Which is closest to 595 + 804 + 605? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  10. 10.Which is closest to 296 × 69? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  11. 11.Which is closest to 598 + 402 + 904? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  12. 12.Round 87.42 to one decimal place. =
  13. 13.Which is closest to 605 + 402 + 105? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  14. 14.Round 72553 to the nearest thousand.
  15. 15.Which is closest to 2794 ÷ 41? (a) 35 (b) 700 (c) 70 (d) 140
  16. 16.Which is closest to 901 × 49? (Round each number first.) (a) 4500 (b) 45000 (c) 90000 (d) 450000
  17. 17.Round 11812 to the nearest ten.
  18. 18.Round 15.92 to one decimal place. =
  19. 19.Which is closest to 603 × 31? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  20. 20.Which is closest to 704 × 82? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  21. 21.Round 46.87 to one decimal place. =
  22. 22.Which is closest to 2093 ÷ 29? (a) 700 (b) 35 (c) 140 (d) 70
  23. 23.Round 85.66 to one decimal place. =
  24. 24.Round 64349 to the nearest thousand.
  25. 25.Which is closest to 603 × 28? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  26. 26.Which is closest to 900 × 71? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  27. 27.Round 71.79 to one decimal place. =
  28. 28.Which is closest to 501 + 98 + 305? (a) 800 (b) 900 (c) 1000 (d) 1100
  29. 29.Which is closest to 704 × 48? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  30. 30.Which is closest to 1399 ÷ 19? (a) 700 (b) 70 (c) 140 (d) 35
  31. 31.Which is closest to 204 + 702 + 803? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  32. 32.Round 80.59 to one decimal place. =
  33. 33.Which is closest to 405 ÷ 19? (a) 40 (b) 10 (c) 200 (d) 20
  34. 34.Round 27085 to the nearest thousand.
  35. 35.Round 26768 to the nearest hundred.
  36. 36.Round 51566 to the nearest hundred.
  37. 37.Which is closest to 196 + 497 + 396? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  38. 38.Round 4807 to the nearest thousand.
  39. 39.Which is closest to 498 × 31? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  40. 40.Which is closest to 101 + 297 + 402? (a) 1000 (b) 900 (c) 800 (d) 700

Answer key

  1. 12000
  2. 75.5
  3. 11220
  4. 900
  5. 72000
  6. 21000
  7. 86800
  8. 5300
  9. 2000
  10. 21000
  11. 1900
  12. 87.4
  13. 1100
  14. 73000
  15. 70
  16. 45000
  17. 11810
  18. 15.9
  19. 18000
  20. 56000
  21. 46.9
  22. 70
  23. 85.7
  24. 64000
  25. 18000
  26. 63000
  27. 71.8
  28. 900
  29. 35000
  30. 70
  31. 1700
  32. 80.6
  33. 20
  34. 27000
  35. 26800
  36. 51600
  37. 1100
  38. 5000
  39. 15000
  40. 800

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