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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 972 · 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.Which is closest to 804 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  2. 2.Which is closest to 197 × 19? (Round each number first.) (a) 4000 (b) 40000 (c) 8000 (d) 400
  3. 3.Which is closest to 801 × 49? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  4. 4.Which is closest to 903 + 804 + 105? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  5. 5.Which is closest to 798 + 600 + 305? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  6. 6.Round 63.58 to one decimal place. =
  7. 7.Round 92802 to the nearest hundred.
  8. 8.Which is closest to 505 + 103 + 204? (a) 700 (b) 1000 (c) 900 (d) 800
  9. 9.Which is closest to 602 × 68? (Round each number first.) (a) 42000 (b) 420000 (c) 84000 (d) 4200
  10. 10.Round 29.92 to one decimal place. =
  11. 11.Which is closest to 600 + 604 + 301? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  12. 12.Which is closest to 503 + 497 + 501? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  13. 13.Round 45.44 to one decimal place. =
  14. 14.Which is closest to 199 + 199 + 595? (a) 900 (b) 1100 (c) 1000 (d) 1200
  15. 15.Round 46304 to the nearest hundred.
  16. 16.Which is closest to 2000 ÷ 49? (a) 80 (b) 20 (c) 400 (d) 40
  17. 17.Round 18.76 to one decimal place. =
  18. 18.Which is closest to 703 × 59? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
  19. 19.Which is closest to 1199 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  20. 20.Round 58.33 to one decimal place. =
  21. 21.Round 16577 to the nearest ten.
  22. 22.Which is closest to 501 + 699 + 695? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  23. 23.Which is closest to 498 + 398 + 203? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  24. 24.Which is closest to 800 × 39? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  25. 25.Which is closest to 1794 ÷ 21? (a) 900 (b) 90 (c) 45 (d) 180
  26. 26.Round 74628 to the nearest hundred.
  27. 27.Which is closest to 999 ÷ 49? (a) 200 (b) 20 (c) 40 (d) 10
  28. 28.Round 97273 to the nearest thousand.
  29. 29.Which is closest to 807 ÷ 19? (a) 40 (b) 80 (c) 400 (d) 20
  30. 30.Which is closest to 1496 ÷ 49? (a) 15 (b) 60 (c) 30 (d) 300
  31. 31.Round 56.41 to one decimal place. =
  32. 32.Which is closest to 504 + 600 + 897? (a) 2000 (b) 2100 (c) 1900 (d) 2200
  33. 33.Round 57.34 to one decimal place. =
  34. 34.Round 77762 to the nearest thousand.
  35. 35.Round 67791 to the nearest ten.
  36. 36.Which is closest to 3991 ÷ 51? (a) 80 (b) 800 (c) 40 (d) 160
  37. 37.Round 23.62 to one decimal place. =
  38. 38.Which is closest to 795 + 900 + 305? (a) 2100 (b) 1900 (c) 2000 (d) 2200
  39. 39.Which is closest to 1492 ÷ 49? (a) 60 (b) 300 (c) 15 (d) 30
  40. 40.Which is closest to 204 × 71? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000

Answer key

  1. 24000
  2. 4000
  3. 40000
  4. 1800
  5. 1700
  6. 63.6
  7. 92800
  8. 800
  9. 42000
  10. 29.9
  11. 1500
  12. 1500
  13. 45.4
  14. 1000
  15. 46300
  16. 40
  17. 18.8
  18. 42000
  19. 60
  20. 58.3
  21. 16580
  22. 1900
  23. 1100
  24. 32000
  25. 90
  26. 74600
  27. 20
  28. 97000
  29. 40
  30. 30
  31. 56.4
  32. 2000
  33. 57.3
  34. 78000
  35. 67790
  36. 80
  37. 23.6
  38. 2000
  39. 30
  40. 14000

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