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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 565 · 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 57.77 to one decimal place. =
  2. 2.Round 29.53 to one decimal place. =
  3. 3.Round 96712 to the nearest hundred.
  4. 4.Round 50.53 to one decimal place. =
  5. 5.Which is closest to 99 + 201 + 504? (a) 900 (b) 1000 (c) 700 (d) 800
  6. 6.Round 88.57 to one decimal place. =
  7. 7.Round 48.12 to one decimal place. =
  8. 8.Which is closest to 1502 ÷ 29? (a) 500 (b) 100 (c) 25 (d) 50
  9. 9.Which is closest to 498 + 501 + 103? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  10. 10.Which is closest to 1492 ÷ 29? (a) 100 (b) 50 (c) 25 (d) 500
  11. 11.Which is closest to 893 ÷ 29? (a) 15 (b) 60 (c) 300 (d) 30
  12. 12.Which is closest to 3993 ÷ 51? (a) 40 (b) 800 (c) 160 (d) 80
  13. 13.Which is closest to 2503 ÷ 49? (a) 500 (b) 50 (c) 100 (d) 25
  14. 14.Round 70.29 to one decimal place. =
  15. 15.Round 71856 to the nearest ten.
  16. 16.Which is closest to 1195 ÷ 29? (a) 40 (b) 80 (c) 20 (d) 400
  17. 17.Which is closest to 401 + 97 + 604? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  18. 18.Round 28.59 to one decimal place. =
  19. 19.Which is closest to 702 + 404 + 504? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  20. 20.Which is closest to 1195 ÷ 41? (a) 30 (b) 60 (c) 15 (d) 300
  21. 21.Which is closest to 95 + 97 + 705? (a) 1000 (b) 1100 (c) 800 (d) 900
  22. 22.Round 27823 to the nearest thousand.
  23. 23.Which is closest to 704 + 205 + 801? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  24. 24.Which is closest to 600 + 896 + 95? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  25. 25.Which is closest to 699 + 595 + 703? (a) 2000 (b) 1900 (c) 2200 (d) 2100
  26. 26.Which is closest to 204 × 21? (Round each number first.) (a) 8000 (b) 4000 (c) 400 (d) 40000
  27. 27.Round 85382 to the nearest ten.
  28. 28.Which is closest to 602 ÷ 31? (a) 200 (b) 40 (c) 20 (d) 10
  29. 29.Round 94.64 to one decimal place. =
  30. 30.Which is closest to 1005 ÷ 19? (a) 500 (b) 100 (c) 25 (d) 50
  31. 31.Which is closest to 3194 ÷ 41? (a) 160 (b) 40 (c) 800 (d) 80
  32. 32.Which is closest to 3006 ÷ 49? (a) 30 (b) 600 (c) 120 (d) 60
  33. 33.Which is closest to 696 + 203 + 301? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  34. 34.Round 10284 to the nearest ten.
  35. 35.Which is closest to 95 + 299 + 95? (a) 500 (b) 700 (c) 600 (d) 400
  36. 36.Round 23614 to the nearest hundred.
  37. 37.Round 30888 to the nearest ten.
  38. 38.Round 61.51 to one decimal place. =
  39. 39.Round 90371 to the nearest thousand.
  40. 40.Round 30.49 to one decimal place. =

Answer key

  1. 57.8
  2. 29.5
  3. 96700
  4. 50.5
  5. 800
  6. 88.6
  7. 48.1
  8. 50
  9. 1100
  10. 50
  11. 30
  12. 80
  13. 50
  14. 70.3
  15. 71860
  16. 40
  17. 1100
  18. 28.6
  19. 1600
  20. 30
  21. 900
  22. 28000
  23. 1700
  24. 1600
  25. 2000
  26. 4000
  27. 85380
  28. 20
  29. 94.6
  30. 50
  31. 80
  32. 60
  33. 1200
  34. 10280
  35. 500
  36. 23600
  37. 30890
  38. 61.5
  39. 90000
  40. 30.5

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