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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 188 · 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 601 × 82? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  2. 2.Round 39.71 to one decimal place. =
  3. 3.Which is closest to 897 × 50? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  4. 4.Which is closest to 601 ÷ 29? (a) 40 (b) 200 (c) 20 (d) 10
  5. 5.Round 34.23 to one decimal place. =
  6. 6.Round 83.49 to one decimal place. =
  7. 7.Round 15.69 to one decimal place. =
  8. 8.Which is closest to 198 × 78? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  9. 9.Which is closest to 898 × 31? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  10. 10.Round 21.08 to one decimal place. =
  11. 11.Which is closest to 696 + 598 + 799? (a) 2200 (b) 2300 (c) 2100 (d) 2000
  12. 12.Round 14.32 to one decimal place. =
  13. 13.Which is closest to 498 × 21? (Round each number first.) (a) 10000 (b) 20000 (c) 100000 (d) 1000
  14. 14.Round 9256 to the nearest hundred.
  15. 15.Round 41274 to the nearest ten.
  16. 16.Which is closest to 301 × 70? (Round each number first.) (a) 210000 (b) 21000 (c) 42000 (d) 2100
  17. 17.Which is closest to 799 + 503 + 901? (a) 2300 (b) 2100 (c) 2400 (d) 2200
  18. 18.Which is closest to 595 + 301 + 495? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  19. 19.Which is closest to 797 × 29? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  20. 20.Round 76.81 to one decimal place. =
  21. 21.Which is closest to 600 + 605 + 703? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  22. 22.Which is closest to 1492 ÷ 29? (a) 500 (b) 50 (c) 100 (d) 25
  23. 23.Which is closest to 196 × 78? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  24. 24.Which is closest to 397 × 41? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  25. 25.Round 78046 to the nearest thousand.
  26. 26.Which is closest to 703 × 19? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  27. 27.Which is closest to 1804 ÷ 21? (a) 45 (b) 900 (c) 180 (d) 90
  28. 28.Round 36.21 to one decimal place. =
  29. 29.Which is closest to 304 × 21? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  30. 30.Round 11080 to the nearest thousand.
  31. 31.Which is closest to 596 × 58? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  32. 32.Which is closest to 498 × 78? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  33. 33.Which is closest to 604 + 399 + 98? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  34. 34.Round 55586 to the nearest hundred.
  35. 35.Which is closest to 702 × 49? (Round each number first.) (a) 70000 (b) 35000 (c) 350000 (d) 3500
  36. 36.Round 18.53 to one decimal place. =
  37. 37.Which is closest to 403 × 58? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  38. 38.Round 71.12 to one decimal place. =
  39. 39.Which is closest to 901 × 68? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  40. 40.Which is closest to 2808 ÷ 39? (a) 140 (b) 700 (c) 70 (d) 35

Answer key

  1. 48000
  2. 39.7
  3. 45000
  4. 20
  5. 34.2
  6. 83.5
  7. 15.7
  8. 16000
  9. 27000
  10. 21.1
  11. 2100
  12. 14.3
  13. 10000
  14. 9300
  15. 41270
  16. 21000
  17. 2200
  18. 1400
  19. 24000
  20. 76.8
  21. 1900
  22. 50
  23. 16000
  24. 16000
  25. 78000
  26. 14000
  27. 90
  28. 36.2
  29. 6000
  30. 11000
  31. 36000
  32. 40000
  33. 1100
  34. 55600
  35. 35000
  36. 18.5
  37. 24000
  38. 71.1
  39. 63000
  40. 70

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