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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 858 · 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 60047 to the nearest thousand.
  2. 2.Which is closest to 4002 ÷ 49? (a) 80 (b) 800 (c) 40 (d) 160
  3. 3.Round 69.48 to one decimal place. =
  4. 4.Round 53.27 to one decimal place. =
  5. 5.Round 18007 to the nearest ten.
  6. 6.Which is closest to 701 × 51? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  7. 7.Which is closest to 503 × 49? (Round each number first.) (a) 50000 (b) 2500 (c) 250000 (d) 25000
  8. 8.Which is closest to 603 + 204 + 502? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  9. 9.Round 94.64 to one decimal place. =
  10. 10.Round 27336 to the nearest thousand.
  11. 11.Round 63.22 to one decimal place. =
  12. 12.Which is closest to 199 × 58? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  13. 13.Which is closest to 1600 ÷ 19? (a) 160 (b) 40 (c) 800 (d) 80
  14. 14.Which is closest to 395 + 299 + 395? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  15. 15.Which is closest to 897 + 400 + 900? (a) 2300 (b) 2200 (c) 2100 (d) 2400
  16. 16.Which is closest to 602 + 803 + 302? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  17. 17.Round 96.89 to one decimal place. =
  18. 18.Which is closest to 395 + 397 + 601? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  19. 19.Which is closest to 303 + 296 + 205? (a) 700 (b) 900 (c) 1000 (d) 800
  20. 20.Which is closest to 891 ÷ 29? (a) 30 (b) 15 (c) 300 (d) 60
  21. 21.Round 97146 to the nearest hundred.
  22. 22.Round 17131 to the nearest hundred.
  23. 23.Round 13.67 to one decimal place. =
  24. 24.Round 11.76 to one decimal place. =
  25. 25.Which is closest to 898 × 22? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  26. 26.Round 22290 to the nearest thousand.
  27. 27.Round 68.21 to one decimal place. =
  28. 28.Which is closest to 3209 ÷ 41? (a) 160 (b) 800 (c) 40 (d) 80
  29. 29.Which is closest to 1598 ÷ 39? (a) 20 (b) 80 (c) 40 (d) 400
  30. 30.Which is closest to 805 + 800 + 101? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  31. 31.Round 59.17 to one decimal place. =
  32. 32.Round 74493 to the nearest thousand.
  33. 33.Which is closest to 1209 ÷ 21? (a) 600 (b) 120 (c) 60 (d) 30
  34. 34.Which is closest to 1797 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120
  35. 35.Which is closest to 402 × 32? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  36. 36.Round 3643 to the nearest ten.
  37. 37.Which is closest to 2806 ÷ 41? (a) 70 (b) 700 (c) 140 (d) 35
  38. 38.Round 56.86 to one decimal place. =
  39. 39.Which is closest to 2497 ÷ 49? (a) 50 (b) 500 (c) 25 (d) 100
  40. 40.Which is closest to 603 × 52? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000

Answer key

  1. 60000
  2. 80
  3. 69.5
  4. 53.3
  5. 18010
  6. 35000
  7. 25000
  8. 1300
  9. 94.6
  10. 27000
  11. 63.2
  12. 12000
  13. 80
  14. 1100
  15. 2200
  16. 1700
  17. 96.9
  18. 1400
  19. 800
  20. 30
  21. 97100
  22. 17100
  23. 13.7
  24. 11.8
  25. 18000
  26. 22000
  27. 68.2
  28. 80
  29. 40
  30. 1700
  31. 59.2
  32. 74000
  33. 60
  34. 60
  35. 12000
  36. 3640
  37. 70
  38. 56.9
  39. 50
  40. 30000

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