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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 948 · 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 78.37 to one decimal place. =
  2. 2.Round 32811 to the nearest hundred.
  3. 3.Round 90275 to the nearest hundred.
  4. 4.Which is closest to 196 × 58? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  5. 5.Which is closest to 303 + 802 + 498? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  6. 6.Which is closest to 204 + 705 + 602? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  7. 7.Which is closest to 500 + 801 + 699? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  8. 8.Which is closest to 3194 ÷ 41? (a) 80 (b) 160 (c) 40 (d) 800
  9. 9.Which is closest to 2403 ÷ 39? (a) 600 (b) 30 (c) 60 (d) 120
  10. 10.Which is closest to 297 + 197 + 302? (a) 1000 (b) 700 (c) 800 (d) 900
  11. 11.Which is closest to 403 × 60? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  12. 12.Which is closest to 298 × 29? (Round each number first.) (a) 900 (b) 90000 (c) 9000 (d) 18000
  13. 13.Round 81.91 to one decimal place. =
  14. 14.Round 80.47 to one decimal place. =
  15. 15.Which is closest to 295 + 696 + 696? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  16. 16.Which is closest to 1794 ÷ 31? (a) 60 (b) 120 (c) 30 (d) 600
  17. 17.Which is closest to 402 × 42? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  18. 18.Round 72.41 to one decimal place. =
  19. 19.Which is closest to 1602 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  20. 20.Round 28196 to the nearest ten.
  21. 21.Which is closest to 800 × 81? (Round each number first.) (a) 6400 (b) 640000 (c) 128000 (d) 64000
  22. 22.Which is closest to 798 × 70? (Round each number first.) (a) 560000 (b) 56000 (c) 112000 (d) 5600
  23. 23.Which is closest to 897 × 91? (Round each number first.) (a) 810000 (b) 8100 (c) 162000 (d) 81000
  24. 24.Which is closest to 496 × 18? (Round each number first.) (a) 100000 (b) 10000 (c) 1000 (d) 20000
  25. 25.Round 55.74 to one decimal place. =
  26. 26.Which is closest to 497 × 41? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
  27. 27.Round 84152 to the nearest ten.
  28. 28.Which is closest to 2407 ÷ 31? (a) 160 (b) 800 (c) 40 (d) 80
  29. 29.Round 15034 to the nearest ten.
  30. 30.Which is closest to 2806 ÷ 41? (a) 140 (b) 70 (c) 35 (d) 700
  31. 31.Round 73327 to the nearest ten.
  32. 32.Round 19852 to the nearest ten.
  33. 33.Which is closest to 303 + 701 + 801? (a) 1900 (b) 1800 (c) 2000 (d) 1700
  34. 34.Which is closest to 305 + 802 + 501? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  35. 35.Which is closest to 600 × 22? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  36. 36.Which is closest to 703 × 32? (Round each number first.) (a) 42000 (b) 2100 (c) 210000 (d) 21000
  37. 37.Round 84.13 to one decimal place. =
  38. 38.Round 83.18 to one decimal place. =
  39. 39.Round 76.62 to one decimal place. =
  40. 40.Which is closest to 1608 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80

Answer key

  1. 78.4
  2. 32800
  3. 90300
  4. 12000
  5. 1600
  6. 1500
  7. 2000
  8. 80
  9. 60
  10. 800
  11. 24000
  12. 9000
  13. 81.9
  14. 80.5
  15. 1700
  16. 60
  17. 16000
  18. 72.4
  19. 80
  20. 28200
  21. 64000
  22. 56000
  23. 81000
  24. 10000
  25. 55.7
  26. 20000
  27. 84150
  28. 80
  29. 15030
  30. 70
  31. 73330
  32. 19850
  33. 1800
  34. 1600
  35. 12000
  36. 21000
  37. 84.1
  38. 83.2
  39. 76.6
  40. 40

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