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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 341 · 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 203 × 38? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  2. 2.Which is closest to 1606 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  3. 3.Which is closest to 497 × 21? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
  4. 4.Round 39.77 to one decimal place. =
  5. 5.Which is closest to 298 + 596 + 802? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  6. 6.Which is closest to 4006 ÷ 51? (a) 800 (b) 80 (c) 40 (d) 160
  7. 7.Which is closest to 100 + 903 + 97? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  8. 8.Round 23.37 to one decimal place. =
  9. 9.Which is closest to 1591 ÷ 21? (a) 800 (b) 40 (c) 80 (d) 160
  10. 10.Which is closest to 703 + 796 + 795? (a) 2300 (b) 2200 (c) 2500 (d) 2400
  11. 11.Round 55.59 to one decimal place. =
  12. 12.Round 65530 to the nearest hundred.
  13. 13.Which is closest to 497 + 904 + 196? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  14. 14.Round 60219 to the nearest thousand.
  15. 15.Which is closest to 797 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  16. 16.Which is closest to 903 × 18? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  17. 17.Which is closest to 695 + 505 + 798? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  18. 18.Which is closest to 2100 ÷ 29? (a) 35 (b) 140 (c) 70 (d) 700
  19. 19.Round 79493 to the nearest hundred.
  20. 20.Which is closest to 396 + 398 + 698? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  21. 21.Which is closest to 2993 ÷ 51? (a) 60 (b) 600 (c) 120 (d) 30
  22. 22.Which is closest to 696 × 31? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  23. 23.Which is closest to 504 × 92? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  24. 24.Which is closest to 793 ÷ 21? (a) 40 (b) 400 (c) 80 (d) 20
  25. 25.Which is closest to 697 × 78? (Round each number first.) (a) 5600 (b) 112000 (c) 56000 (d) 560000
  26. 26.Which is closest to 200 × 48? (Round each number first.) (a) 10000 (b) 1000 (c) 20000 (d) 100000
  27. 27.Which is closest to 404 + 203 + 901? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  28. 28.Round 96.48 to one decimal place. =
  29. 29.Which is closest to 396 × 41? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  30. 30.Which is closest to 3195 ÷ 41? (a) 800 (b) 80 (c) 160 (d) 40
  31. 31.Round 41.93 to one decimal place. =
  32. 32.Round 16773 to the nearest ten.
  33. 33.Which is closest to 496 × 50? (Round each number first.) (a) 2500 (b) 25000 (c) 250000 (d) 50000
  34. 34.Which is closest to 498 + 301 + 300? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  35. 35.Which is closest to 701 + 402 + 96? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  36. 36.Which is closest to 298 + 499 + 195? (a) 1000 (b) 900 (c) 1100 (d) 1200
  37. 37.Which is closest to 2792 ÷ 41? (a) 70 (b) 35 (c) 140 (d) 700
  38. 38.Which is closest to 295 + 297 + 803? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  39. 39.Which is closest to 1802 ÷ 21? (a) 900 (b) 90 (c) 45 (d) 180
  40. 40.Which is closest to 296 × 32? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000

Answer key

  1. 8000
  2. 80
  3. 10000
  4. 39.8
  5. 1700
  6. 80
  7. 1100
  8. 23.4
  9. 80
  10. 2300
  11. 55.6
  12. 65500
  13. 1600
  14. 60000
  15. 16000
  16. 18000
  17. 2000
  18. 70
  19. 79500
  20. 1500
  21. 60
  22. 21000
  23. 45000
  24. 40
  25. 56000
  26. 10000
  27. 1500
  28. 96.5
  29. 16000
  30. 80
  31. 41.9
  32. 16770
  33. 25000
  34. 1100
  35. 1200
  36. 1000
  37. 70
  38. 1400
  39. 90
  40. 9000

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