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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 305 · 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 299 × 69? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  2. 2.Which is closest to 198 × 78? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  3. 3.Round 66.63 to one decimal place. =
  4. 4.Which is closest to 902 × 88? (Round each number first.) (a) 81000 (b) 8100 (c) 810000 (d) 162000
  5. 5.Which is closest to 202 + 903 + 403? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  6. 6.Round 10.57 to one decimal place. =
  7. 7.Which is closest to 498 + 404 + 195? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  8. 8.Which is closest to 895 ÷ 31? (a) 300 (b) 30 (c) 60 (d) 15
  9. 9.Which is closest to 296 × 22? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  10. 10.Which is closest to 398 × 81? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  11. 11.Round 51.86 to one decimal place. =
  12. 12.Which is closest to 197 × 21? (Round each number first.) (a) 4000 (b) 8000 (c) 40000 (d) 400
  13. 13.Round 17557 to the nearest ten.
  14. 14.Which is closest to 297 + 604 + 702? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  15. 15.Round 16016 to the nearest ten.
  16. 16.Which is closest to 599 + 402 + 96? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  17. 17.Round 91440 to the nearest hundred.
  18. 18.Which is closest to 203 × 62? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  19. 19.Round 94.58 to one decimal place. =
  20. 20.Round 96516 to the nearest hundred.
  21. 21.Which is closest to 398 × 19? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
  22. 22.Which is closest to 699 × 18? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  23. 23.Round 28.32 to one decimal place. =
  24. 24.Which is closest to 197 × 19? (Round each number first.) (a) 8000 (b) 40000 (c) 400 (d) 4000
  25. 25.Round 52326 to the nearest ten.
  26. 26.Which is closest to 804 × 20? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  27. 27.Which is closest to 496 + 605 + 699? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  28. 28.Which is closest to 300 × 58? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  29. 29.Which is closest to 500 + 200 + 302? (a) 900 (b) 1100 (c) 1000 (d) 1200
  30. 30.Round 30949 to the nearest hundred.
  31. 31.Which is closest to 698 × 19? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  32. 32.Which is closest to 1808 ÷ 31? (a) 120 (b) 30 (c) 60 (d) 600
  33. 33.Which is closest to 99 + 595 + 495? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  34. 34.Which is closest to 397 + 304 + 605? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  35. 35.Which is closest to 1608 ÷ 19? (a) 800 (b) 40 (c) 80 (d) 160
  36. 36.Which is closest to 3604 ÷ 39? (a) 900 (b) 45 (c) 180 (d) 90
  37. 37.Which is closest to 196 + 602 + 501? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  38. 38.Round 80.07 to one decimal place. =
  39. 39.Which is closest to 1609 ÷ 41? (a) 400 (b) 80 (c) 20 (d) 40
  40. 40.Round 10.38 to one decimal place. =

Answer key

  1. 21000
  2. 16000
  3. 66.6
  4. 81000
  5. 1500
  6. 10.6
  7. 1100
  8. 30
  9. 6000
  10. 32000
  11. 51.9
  12. 4000
  13. 17560
  14. 1600
  15. 16020
  16. 1100
  17. 91400
  18. 12000
  19. 94.6
  20. 96500
  21. 8000
  22. 14000
  23. 28.3
  24. 4000
  25. 52330
  26. 16000
  27. 1800
  28. 18000
  29. 1000
  30. 30900
  31. 14000
  32. 60
  33. 1200
  34. 1300
  35. 80
  36. 90
  37. 1300
  38. 80.1
  39. 40
  40. 10.4

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