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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 109 · 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 50446 to the nearest ten.
  2. 2.Round 55.59 to one decimal place. =
  3. 3.Which is closest to 802 + 595 + 602? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  4. 4.Round 13.33 to one decimal place. =
  5. 5.Which is closest to 400 + 301 + 97? (a) 900 (b) 800 (c) 700 (d) 1000
  6. 6.Round 69.64 to one decimal place. =
  7. 7.Which is closest to 2101 ÷ 29? (a) 140 (b) 70 (c) 700 (d) 35
  8. 8.Which is closest to 798 × 78? (Round each number first.) (a) 6400 (b) 640000 (c) 128000 (d) 64000
  9. 9.Round 31.49 to one decimal place. =
  10. 10.Which is closest to 99 + 197 + 901? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  11. 11.Which is closest to 806 ÷ 21? (a) 20 (b) 400 (c) 80 (d) 40
  12. 12.Which is closest to 696 + 499 + 399? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  13. 13.Which is closest to 2406 ÷ 41? (a) 30 (b) 60 (c) 120 (d) 600
  14. 14.Round 38.94 to one decimal place. =
  15. 15.Round 17773 to the nearest hundred.
  16. 16.Round 34.71 to one decimal place. =
  17. 17.Which is closest to 403 + 701 + 903? (a) 1900 (b) 2200 (c) 2100 (d) 2000
  18. 18.Which is closest to 804 + 499 + 403? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  19. 19.Which is closest to 796 + 495 + 600? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  20. 20.Round 77.09 to one decimal place. =
  21. 21.Round 80.38 to one decimal place. =
  22. 22.Round 22229 to the nearest hundred.
  23. 23.Which is closest to 896 + 898 + 398? (a) 2300 (b) 2400 (c) 2100 (d) 2200
  24. 24.Round 69651 to the nearest hundred.
  25. 25.Which is closest to 1400 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  26. 26.Which is closest to 1203 ÷ 41? (a) 15 (b) 300 (c) 30 (d) 60
  27. 27.Round 27.73 to one decimal place. =
  28. 28.Which is closest to 795 + 505 + 195? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  29. 29.Which is closest to 201 + 98 + 400? (a) 700 (b) 800 (c) 600 (d) 900
  30. 30.Round 55205 to the nearest hundred.
  31. 31.Which is closest to 596 × 40? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  32. 32.Which is closest to 203 × 20? (Round each number first.) (a) 8000 (b) 400 (c) 4000 (d) 40000
  33. 33.Which is closest to 304 × 81? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  34. 34.Which is closest to 396 ÷ 19? (a) 20 (b) 40 (c) 10 (d) 200
  35. 35.Round 1136 to the nearest ten.
  36. 36.Which is closest to 101 + 100 + 802? (a) 1000 (b) 900 (c) 1100 (d) 1200
  37. 37.Which is closest to 798 × 50? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  38. 38.Round 59.41 to one decimal place. =
  39. 39.Round 60023 to the nearest thousand.
  40. 40.Round 45.09 to one decimal place. =

Answer key

  1. 50450
  2. 55.6
  3. 2000
  4. 13.3
  5. 800
  6. 69.6
  7. 70
  8. 64000
  9. 31.5
  10. 1200
  11. 40
  12. 1600
  13. 60
  14. 38.9
  15. 17800
  16. 34.7
  17. 2000
  18. 1700
  19. 1900
  20. 77.1
  21. 80.4
  22. 22200
  23. 2200
  24. 69700
  25. 70
  26. 30
  27. 27.7
  28. 1500
  29. 700
  30. 55200
  31. 24000
  32. 4000
  33. 24000
  34. 20
  35. 1140
  36. 1000
  37. 40000
  38. 59.4
  39. 60000
  40. 45.1

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