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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 253 · 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 43394 to the nearest hundred.
  2. 2.Round 27982 to the nearest thousand.
  3. 3.Which is closest to 991 ÷ 51? (a) 10 (b) 200 (c) 40 (d) 20
  4. 4.Which is closest to 597 + 202 + 602? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  5. 5.Which is closest to 609 ÷ 21? (a) 300 (b) 15 (c) 30 (d) 60
  6. 6.Round 78241 to the nearest ten.
  7. 7.Which is closest to 606 ÷ 29? (a) 40 (b) 10 (c) 200 (d) 20
  8. 8.Which is closest to 503 × 21? (Round each number first.) (a) 20000 (b) 10000 (c) 1000 (d) 100000
  9. 9.Round 21.87 to one decimal place. =
  10. 10.Round 76.27 to one decimal place. =
  11. 11.Which is closest to 2807 ÷ 41? (a) 35 (b) 140 (c) 700 (d) 70
  12. 12.Which is closest to 200 × 29? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  13. 13.Round 27498 to the nearest ten.
  14. 14.Round 39.73 to one decimal place. =
  15. 15.Round 10.83 to one decimal place. =
  16. 16.Which is closest to 901 ÷ 31? (a) 60 (b) 30 (c) 15 (d) 300
  17. 17.Round 66.18 to one decimal place. =
  18. 18.Round 22921 to the nearest thousand.
  19. 19.Which is closest to 201 + 505 + 903? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  20. 20.Which is closest to 3503 ÷ 51? (a) 700 (b) 140 (c) 70 (d) 35
  21. 21.Which is closest to 200 × 92? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  22. 22.Which is closest to 896 × 31? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  23. 23.Which is closest to 802 + 701 + 200? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  24. 24.Round 35.07 to one decimal place. =
  25. 25.Which is closest to 397 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  26. 26.Which is closest to 201 + 702 + 598? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  27. 27.Which is closest to 601 ÷ 21? (a) 30 (b) 15 (c) 300 (d) 60
  28. 28.Round 55231 to the nearest ten.
  29. 29.Round 75.84 to one decimal place. =
  30. 30.Round 91.37 to one decimal place. =
  31. 31.Which is closest to 497 + 697 + 599? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  32. 32.Which is closest to 197 + 197 + 204? (a) 800 (b) 700 (c) 500 (d) 600
  33. 33.Round 66.21 to one decimal place. =
  34. 34.Which is closest to 503 + 104 + 102? (a) 900 (b) 800 (c) 700 (d) 600
  35. 35.Which is closest to 697 × 72? (Round each number first.) (a) 98000 (b) 490000 (c) 49000 (d) 4900
  36. 36.Which is closest to 204 × 18? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  37. 37.Which is closest to 1193 ÷ 41? (a) 30 (b) 300 (c) 15 (d) 60
  38. 38.Which is closest to 901 × 59? (Round each number first.) (a) 54000 (b) 5400 (c) 108000 (d) 540000
  39. 39.Round 95.44 to one decimal place. =
  40. 40.Round 36.81 to one decimal place. =

Answer key

  1. 43400
  2. 28000
  3. 20
  4. 1400
  5. 30
  6. 78240
  7. 20
  8. 10000
  9. 21.9
  10. 76.3
  11. 70
  12. 6000
  13. 27500
  14. 39.7
  15. 10.8
  16. 30
  17. 66.2
  18. 23000
  19. 1600
  20. 70
  21. 18000
  22. 27000
  23. 1700
  24. 35.1
  25. 20
  26. 1500
  27. 30
  28. 55230
  29. 75.8
  30. 91.4
  31. 1800
  32. 600
  33. 66.2
  34. 700
  35. 49000
  36. 4000
  37. 30
  38. 54000
  39. 95.4
  40. 36.8

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