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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 282 · 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 99159 to the nearest hundred.
  2. 2.Which is closest to 904 + 395 + 498? (a) 1800 (b) 2000 (c) 1900 (d) 1700
  3. 3.Round 30556 to the nearest thousand.
  4. 4.Which is closest to 1605 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  5. 5.Round 47235 to the nearest hundred.
  6. 6.Which is closest to 202 × 18? (Round each number first.) (a) 400 (b) 40000 (c) 4000 (d) 8000
  7. 7.Which is closest to 1196 ÷ 29? (a) 20 (b) 40 (c) 80 (d) 400
  8. 8.Which is closest to 198 × 68? (Round each number first.) (a) 14000 (b) 140000 (c) 1400 (d) 28000
  9. 9.Which is closest to 304 + 297 + 697? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  10. 10.Round 56.66 to one decimal place. =
  11. 11.Which is closest to 398 + 199 + 600? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  12. 12.Which is closest to 904 × 89? (Round each number first.) (a) 162000 (b) 81000 (c) 8100 (d) 810000
  13. 13.Which is closest to 401 + 595 + 100? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  14. 14.Round 9259 to the nearest thousand.
  15. 15.Which is closest to 896 × 68? (Round each number first.) (a) 630000 (b) 63000 (c) 6300 (d) 126000
  16. 16.Round 5097 to the nearest ten.
  17. 17.Round 78.62 to one decimal place. =
  18. 18.Which is closest to 304 × 32? (Round each number first.) (a) 9000 (b) 18000 (c) 90000 (d) 900
  19. 19.Round 98286 to the nearest thousand.
  20. 20.Which is closest to 503 × 51? (Round each number first.) (a) 250000 (b) 2500 (c) 25000 (d) 50000
  21. 21.Round 27063 to the nearest ten.
  22. 22.Round 62.88 to one decimal place. =
  23. 23.Which is closest to 900 × 49? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  24. 24.Which is closest to 597 + 301 + 396? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  25. 25.Round 72.79 to one decimal place. =
  26. 26.Which is closest to 3506 ÷ 51? (a) 140 (b) 70 (c) 700 (d) 35
  27. 27.Round 37.24 to one decimal place. =
  28. 28.Which is closest to 295 + 904 + 97? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  29. 29.Round 53886 to the nearest thousand.
  30. 30.Round 22157 to the nearest ten.
  31. 31.Which is closest to 501 × 79? (Round each number first.) (a) 4000 (b) 40000 (c) 80000 (d) 400000
  32. 32.Which is closest to 3201 ÷ 39? (a) 160 (b) 80 (c) 40 (d) 800
  33. 33.Round 48.54 to one decimal place. =
  34. 34.Round 56.06 to one decimal place. =
  35. 35.Which is closest to 803 × 48? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  36. 36.Round 92.76 to one decimal place. =
  37. 37.Which is closest to 401 + 602 + 799? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  38. 38.Round 72.77 to one decimal place. =
  39. 39.Round 68.66 to one decimal place. =
  40. 40.Round 78052 to the nearest hundred.

Answer key

  1. 99200
  2. 1800
  3. 31000
  4. 80
  5. 47200
  6. 4000
  7. 40
  8. 14000
  9. 1300
  10. 56.7
  11. 1200
  12. 81000
  13. 1100
  14. 9000
  15. 63000
  16. 5100
  17. 78.6
  18. 9000
  19. 98000
  20. 25000
  21. 27060
  22. 62.9
  23. 45000
  24. 1300
  25. 72.8
  26. 70
  27. 37.2
  28. 1300
  29. 54000
  30. 22160
  31. 40000
  32. 80
  33. 48.5
  34. 56.1
  35. 40000
  36. 92.8
  37. 1800
  38. 72.8
  39. 68.7
  40. 78100

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