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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 426 · 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 37586 to the nearest ten.
  2. 2.Which is closest to 502 + 196 + 904? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  3. 3.Round 31687 to the nearest ten.
  4. 4.Which is closest to 398 × 70? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  5. 5.Which is closest to 697 × 32? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  6. 6.Which is closest to 2103 ÷ 29? (a) 700 (b) 35 (c) 140 (d) 70
  7. 7.Which is closest to 98 + 396 + 202? (a) 700 (b) 800 (c) 900 (d) 600
  8. 8.Which is closest to 700 + 300 + 199? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  9. 9.Which is closest to 499 × 52? (Round each number first.) (a) 2500 (b) 50000 (c) 250000 (d) 25000
  10. 10.Which is closest to 1592 ÷ 21? (a) 160 (b) 40 (c) 80 (d) 800
  11. 11.Round 97.72 to one decimal place. =
  12. 12.Which is closest to 804 + 798 + 597? (a) 2300 (b) 2200 (c) 2400 (d) 2100
  13. 13.Which is closest to 899 × 50? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  14. 14.Which is closest to 1009 ÷ 49? (a) 10 (b) 200 (c) 40 (d) 20
  15. 15.Round 12.82 to one decimal place. =
  16. 16.Round 46.44 to one decimal place. =
  17. 17.Round 67158 to the nearest ten.
  18. 18.Round 35472 to the nearest thousand.
  19. 19.Which is closest to 2092 ÷ 29? (a) 70 (b) 35 (c) 700 (d) 140
  20. 20.Round 60549 to the nearest ten.
  21. 21.Which is closest to 504 × 68? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  22. 22.Round 10.72 to one decimal place. =
  23. 23.Which is closest to 504 + 405 + 302? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  24. 24.Which is closest to 802 × 82? (Round each number first.) (a) 640000 (b) 6400 (c) 64000 (d) 128000
  25. 25.Which is closest to 497 × 78? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000
  26. 26.Which is closest to 1605 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  27. 27.Which is closest to 402 × 21? (Round each number first.) (a) 8000 (b) 16000 (c) 800 (d) 80000
  28. 28.Round 13.21 to one decimal place. =
  29. 29.Which is closest to 800 × 28? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  30. 30.Round 27.28 to one decimal place. =
  31. 31.Round 74638 to the nearest thousand.
  32. 32.Which is closest to 2395 ÷ 41? (a) 120 (b) 60 (c) 600 (d) 30
  33. 33.Round 52.86 to one decimal place. =
  34. 34.Round 74.79 to one decimal place. =
  35. 35.Round 62.48 to one decimal place. =
  36. 36.Which is closest to 3492 ÷ 51? (a) 700 (b) 70 (c) 35 (d) 140
  37. 37.Round 12328 to the nearest ten.
  38. 38.Round 84.62 to one decimal place. =
  39. 39.Which is closest to 401 + 597 + 205? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  40. 40.Which is closest to 407 ÷ 21? (a) 200 (b) 40 (c) 10 (d) 20

Answer key

  1. 37590
  2. 1600
  3. 31690
  4. 28000
  5. 21000
  6. 70
  7. 700
  8. 1200
  9. 25000
  10. 80
  11. 97.7
  12. 2200
  13. 45000
  14. 20
  15. 12.8
  16. 46.4
  17. 67160
  18. 35000
  19. 70
  20. 60550
  21. 35000
  22. 10.7
  23. 1200
  24. 64000
  25. 40000
  26. 40
  27. 8000
  28. 13.2
  29. 24000
  30. 27.3
  31. 75000
  32. 60
  33. 52.9
  34. 74.8
  35. 62.5
  36. 70
  37. 12330
  38. 84.6
  39. 1200
  40. 20

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