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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 802 · 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 301 × 59? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  2. 2.Round 55.29 to one decimal place. =
  3. 3.Which is closest to 699 × 40? (Round each number first.) (a) 280000 (b) 2800 (c) 28000 (d) 56000
  4. 4.Which is closest to 1003 ÷ 49? (a) 10 (b) 200 (c) 40 (d) 20
  5. 5.Which is closest to 697 × 18? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  6. 6.Round 23.54 to one decimal place. =
  7. 7.Which is closest to 296 + 98 + 298? (a) 800 (b) 600 (c) 900 (d) 700
  8. 8.Which is closest to 395 + 295 + 298? (a) 1200 (b) 1100 (c) 1000 (d) 900
  9. 9.Which is closest to 696 × 69? (Round each number first.) (a) 98000 (b) 4900 (c) 49000 (d) 490000
  10. 10.Which is closest to 797 + 899 + 198? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  11. 11.Which is closest to 1608 ÷ 21? (a) 160 (b) 40 (c) 800 (d) 80
  12. 12.Which is closest to 197 + 702 + 804? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  13. 13.Which is closest to 998 ÷ 49? (a) 10 (b) 20 (c) 40 (d) 200
  14. 14.Which is closest to 300 × 69? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  15. 15.Round 79125 to the nearest hundred.
  16. 16.Which is closest to 393 ÷ 19? (a) 20 (b) 10 (c) 200 (d) 40
  17. 17.Which is closest to 97 + 596 + 396? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  18. 18.Round 54773 to the nearest thousand.
  19. 19.Which is closest to 201 × 21? (Round each number first.) (a) 4000 (b) 40000 (c) 400 (d) 8000
  20. 20.Round 65.51 to one decimal place. =
  21. 21.Which is closest to 800 + 102 + 701? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  22. 22.Which is closest to 300 × 92? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  23. 23.Which is closest to 900 × 41? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  24. 24.Which is closest to 2995 ÷ 49? (a) 120 (b) 600 (c) 30 (d) 60
  25. 25.Round 55708 to the nearest hundred.
  26. 26.Round 82715 to the nearest hundred.
  27. 27.Round 58429 to the nearest ten.
  28. 28.Which is closest to 497 + 497 + 102? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  29. 29.Which is closest to 3202 ÷ 39? (a) 40 (b) 800 (c) 160 (d) 80
  30. 30.Round 48.46 to one decimal place. =
  31. 31.Round 81.73 to one decimal place. =
  32. 32.Which is closest to 304 + 205 + 601? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  33. 33.Round 39336 to the nearest ten.
  34. 34.Round 83.32 to one decimal place. =
  35. 35.Which is closest to 800 × 41? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  36. 36.Which is closest to 497 × 39? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  37. 37.Round 92.57 to one decimal place. =
  38. 38.Which is closest to 197 × 40? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
  39. 39.Which is closest to 1200 ÷ 21? (a) 120 (b) 30 (c) 60 (d) 600
  40. 40.Round 78346 to the nearest ten.

Answer key

  1. 18000
  2. 55.3
  3. 28000
  4. 20
  5. 14000
  6. 23.5
  7. 700
  8. 1000
  9. 49000
  10. 1900
  11. 80
  12. 1700
  13. 20
  14. 21000
  15. 79100
  16. 20
  17. 1100
  18. 55000
  19. 4000
  20. 65.5
  21. 1600
  22. 27000
  23. 36000
  24. 60
  25. 55700
  26. 82700
  27. 58430
  28. 1100
  29. 80
  30. 48.5
  31. 81.7
  32. 1100
  33. 39340
  34. 83.3
  35. 32000
  36. 20000
  37. 92.6
  38. 8000
  39. 60
  40. 78350

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