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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 247 · 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 21002 to the nearest ten.
  2. 2.Which is closest to 795 + 202 + 805? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  3. 3.Round 45.13 to one decimal place. =
  4. 4.Which is closest to 605 ÷ 31? (a) 40 (b) 10 (c) 20 (d) 200
  5. 5.Round 24806 to the nearest ten.
  6. 6.Which is closest to 201 + 803 + 699? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  7. 7.Round 91988 to the nearest thousand.
  8. 8.Round 87778 to the nearest ten.
  9. 9.Round 81.83 to one decimal place. =
  10. 10.Which is closest to 1008 ÷ 51? (a) 200 (b) 10 (c) 20 (d) 40
  11. 11.Round 95.17 to one decimal place. =
  12. 12.Round 43428 to the nearest ten.
  13. 13.Round 46.38 to one decimal place. =
  14. 14.Which is closest to 804 × 78? (Round each number first.) (a) 640000 (b) 64000 (c) 6400 (d) 128000
  15. 15.Which is closest to 198 + 600 + 95? (a) 900 (b) 1000 (c) 800 (d) 1100
  16. 16.Which is closest to 796 ÷ 41? (a) 200 (b) 20 (c) 10 (d) 40
  17. 17.Round 39.37 to one decimal place. =
  18. 18.Round 22.78 to one decimal place. =
  19. 19.Which is closest to 195 + 401 + 698? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  20. 20.Which is closest to 696 × 72? (Round each number first.) (a) 98000 (b) 4900 (c) 49000 (d) 490000
  21. 21.Which is closest to 796 × 51? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  22. 22.Which is closest to 3605 ÷ 41? (a) 45 (b) 90 (c) 900 (d) 180
  23. 23.Round 90.34 to one decimal place. =
  24. 24.Round 16173 to the nearest thousand.
  25. 25.Round 44.94 to one decimal place. =
  26. 26.Which is closest to 1409 ÷ 19? (a) 35 (b) 700 (c) 70 (d) 140
  27. 27.Which is closest to 403 + 597 + 499? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  28. 28.Which is closest to 897 ÷ 31? (a) 60 (b) 300 (c) 30 (d) 15
  29. 29.Which is closest to 197 × 59? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  30. 30.Which is closest to 300 × 79? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  31. 31.Round 20610 to the nearest thousand.
  32. 32.Which is closest to 4503 ÷ 51? (a) 90 (b) 45 (c) 180 (d) 900
  33. 33.Round 95.31 to one decimal place. =
  34. 34.Round 79703 to the nearest hundred.
  35. 35.Which is closest to 97 + 605 + 295? (a) 1200 (b) 900 (c) 1000 (d) 1100
  36. 36.Which is closest to 1193 ÷ 29? (a) 20 (b) 40 (c) 80 (d) 400
  37. 37.Round 71.64 to one decimal place. =
  38. 38.Which is closest to 302 + 296 + 897? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  39. 39.Which is closest to 1005 ÷ 19? (a) 50 (b) 100 (c) 500 (d) 25
  40. 40.Round 93.82 to one decimal place. =

Answer key

  1. 21000
  2. 1800
  3. 45.1
  4. 20
  5. 24810
  6. 1700
  7. 92000
  8. 87780
  9. 81.8
  10. 20
  11. 95.2
  12. 43430
  13. 46.4
  14. 64000
  15. 900
  16. 20
  17. 39.4
  18. 22.8
  19. 1300
  20. 49000
  21. 40000
  22. 90
  23. 90.3
  24. 16000
  25. 44.9
  26. 70
  27. 1500
  28. 30
  29. 12000
  30. 24000
  31. 21000
  32. 90
  33. 95.3
  34. 79700
  35. 1000
  36. 40
  37. 71.6
  38. 1500
  39. 50
  40. 93.8

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