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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 529 · 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 399 + 901 + 100? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  2. 2.Which is closest to 904 × 70? (Round each number first.) (a) 63000 (b) 6300 (c) 126000 (d) 630000
  3. 3.Which is closest to 396 × 20? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  4. 4.Which is closest to 498 × 39? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  5. 5.Which is closest to 204 × 48? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
  6. 6.Which is closest to 1793 ÷ 31? (a) 30 (b) 600 (c) 120 (d) 60
  7. 7.Round 48448 to the nearest thousand.
  8. 8.Round 59.52 to one decimal place. =
  9. 9.Which is closest to 705 + 101 + 800? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  10. 10.Which is closest to 499 × 28? (Round each number first.) (a) 15000 (b) 30000 (c) 150000 (d) 1500
  11. 11.Which is closest to 500 × 19? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
  12. 12.Which is closest to 202 × 68? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  13. 13.Which is closest to 1997 ÷ 39? (a) 25 (b) 500 (c) 50 (d) 100
  14. 14.Which is closest to 496 × 50? (Round each number first.) (a) 50000 (b) 25000 (c) 250000 (d) 2500
  15. 15.Which is closest to 400 × 31? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  16. 16.Round 42.29 to one decimal place. =
  17. 17.Which is closest to 404 × 52? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  18. 18.Round 9307 to the nearest ten.
  19. 19.Round 19.81 to one decimal place. =
  20. 20.Round 64687 to the nearest ten.
  21. 21.Which is closest to 697 + 101 + 200? (a) 1000 (b) 1200 (c) 1100 (d) 900
  22. 22.Which is closest to 299 + 201 + 596? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  23. 23.Which is closest to 1198 ÷ 39? (a) 15 (b) 300 (c) 30 (d) 60
  24. 24.Round 7298 to the nearest thousand.
  25. 25.Which is closest to 103 + 195 + 395? (a) 900 (b) 700 (c) 600 (d) 800
  26. 26.Which is closest to 807 ÷ 21? (a) 400 (b) 40 (c) 20 (d) 80
  27. 27.Which is closest to 496 × 30? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  28. 28.Which is closest to 298 × 18? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  29. 29.Round 2481 to the nearest hundred.
  30. 30.Round 26.47 to one decimal place. =
  31. 31.Round 65299 to the nearest thousand.
  32. 32.Which is closest to 400 × 51? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  33. 33.Round 74383 to the nearest ten.
  34. 34.Which is closest to 299 × 30? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  35. 35.Which is closest to 1202 ÷ 41? (a) 60 (b) 300 (c) 15 (d) 30
  36. 36.Which is closest to 896 × 29? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  37. 37.Round 23.87 to one decimal place. =
  38. 38.Round 51.24 to one decimal place. =
  39. 39.Which is closest to 797 ÷ 39? (a) 40 (b) 200 (c) 10 (d) 20
  40. 40.Round 92.71 to one decimal place. =

Answer key

  1. 1400
  2. 63000
  3. 8000
  4. 20000
  5. 10000
  6. 60
  7. 48000
  8. 59.5
  9. 1600
  10. 15000
  11. 10000
  12. 14000
  13. 50
  14. 25000
  15. 12000
  16. 42.3
  17. 20000
  18. 9310
  19. 19.8
  20. 64690
  21. 1000
  22. 1100
  23. 30
  24. 7000
  25. 700
  26. 40
  27. 15000
  28. 6000
  29. 2500
  30. 26.5
  31. 65000
  32. 20000
  33. 74380
  34. 9000
  35. 30
  36. 27000
  37. 23.9
  38. 51.2
  39. 20
  40. 92.7

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