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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 793 · 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 65269 to the nearest ten.
  2. 2.Which is closest to 402 × 62? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  3. 3.Round 16.14 to one decimal place. =
  4. 4.Which is closest to 398 + 897 + 96? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  5. 5.Round 84.56 to one decimal place. =
  6. 6.Which is closest to 597 + 597 + 98? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  7. 7.Which is closest to 204 × 32? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  8. 8.Which is closest to 2992 ÷ 51? (a) 30 (b) 120 (c) 60 (d) 600
  9. 9.Round 17618 to the nearest thousand.
  10. 10.Which is closest to 300 + 797 + 95? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  11. 11.Round 79.23 to one decimal place. =
  12. 12.Which is closest to 99 + 303 + 303? (a) 900 (b) 600 (c) 700 (d) 800
  13. 13.Round 74210 to the nearest thousand.
  14. 14.Round 69717 to the nearest hundred.
  15. 15.Round 17375 to the nearest thousand.
  16. 16.Which is closest to 197 × 22? (Round each number first.) (a) 8000 (b) 400 (c) 4000 (d) 40000
  17. 17.Which is closest to 501 × 30? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  18. 18.Round 2229 to the nearest ten.
  19. 19.Round 87.62 to one decimal place. =
  20. 20.Which is closest to 496 × 91? (Round each number first.) (a) 45000 (b) 90000 (c) 4500 (d) 450000
  21. 21.Round 17459 to the nearest hundred.
  22. 22.Round 7290 to the nearest hundred.
  23. 23.Which is closest to 803 × 80? (Round each number first.) (a) 6400 (b) 64000 (c) 128000 (d) 640000
  24. 24.Which is closest to 902 × 68? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  25. 25.Round 20.41 to one decimal place. =
  26. 26.Which is closest to 899 + 699 + 504? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  27. 27.Which is closest to 399 + 602 + 102? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  28. 28.Round 4906 to the nearest ten.
  29. 29.Round 23.11 to one decimal place. =
  30. 30.Which is closest to 696 × 42? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  31. 31.Round 12.74 to one decimal place. =
  32. 32.Round 97.32 to one decimal place. =
  33. 33.Which is closest to 3603 ÷ 39? (a) 900 (b) 90 (c) 180 (d) 45
  34. 34.Which is closest to 497 + 600 + 202? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  35. 35.Round 46.14 to one decimal place. =
  36. 36.Round 96782 to the nearest ten.
  37. 37.Which is closest to 2400 ÷ 31? (a) 160 (b) 800 (c) 80 (d) 40
  38. 38.Which is closest to 705 + 899 + 804? (a) 2600 (b) 2400 (c) 2500 (d) 2300
  39. 39.Round 55.58 to one decimal place. =
  40. 40.Which is closest to 802 + 96 + 302? (a) 1100 (b) 1400 (c) 1300 (d) 1200

Answer key

  1. 65270
  2. 24000
  3. 16.1
  4. 1400
  5. 84.6
  6. 1300
  7. 6000
  8. 60
  9. 18000
  10. 1200
  11. 79.2
  12. 700
  13. 74000
  14. 69700
  15. 17000
  16. 4000
  17. 15000
  18. 2230
  19. 87.6
  20. 45000
  21. 17500
  22. 7300
  23. 64000
  24. 63000
  25. 20.4
  26. 2100
  27. 1100
  28. 4910
  29. 23.1
  30. 28000
  31. 12.7
  32. 97.3
  33. 90
  34. 1300
  35. 46.1
  36. 96780
  37. 80
  38. 2400
  39. 55.6
  40. 1200

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