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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 354 · 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 497 × 19? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  2. 2.Round 33.84 to one decimal place. =
  3. 3.Which is closest to 499 × 50? (Round each number first.) (a) 250000 (b) 25000 (c) 2500 (d) 50000
  4. 4.Which is closest to 596 + 904 + 795? (a) 2300 (b) 2500 (c) 2400 (d) 2200
  5. 5.Round 68628 to the nearest hundred.
  6. 6.Round 98148 to the nearest hundred.
  7. 7.Round 10846 to the nearest hundred.
  8. 8.Which is closest to 301 + 97 + 198? (a) 700 (b) 600 (c) 800 (d) 500
  9. 9.Round 69321 to the nearest hundred.
  10. 10.Round 40.93 to one decimal place. =
  11. 11.Which is closest to 601 × 28? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  12. 12.Round 81.78 to one decimal place. =
  13. 13.Round 80.19 to one decimal place. =
  14. 14.Which is closest to 297 × 70? (Round each number first.) (a) 2100 (b) 21000 (c) 210000 (d) 42000
  15. 15.Round 70.41 to one decimal place. =
  16. 16.Which is closest to 105 + 505 + 499? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  17. 17.Which is closest to 4506 ÷ 49? (a) 900 (b) 180 (c) 45 (d) 90
  18. 18.Round 68693 to the nearest hundred.
  19. 19.Which is closest to 697 × 72? (Round each number first.) (a) 49000 (b) 490000 (c) 4900 (d) 98000
  20. 20.Which is closest to 2991 ÷ 51? (a) 120 (b) 30 (c) 60 (d) 600
  21. 21.Which is closest to 597 + 296 + 596? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  22. 22.Which is closest to 704 + 503 + 897? (a) 2200 (b) 2000 (c) 2100 (d) 2300
  23. 23.Round 69.41 to one decimal place. =
  24. 24.Round 19418 to the nearest ten.
  25. 25.Round 3242 to the nearest thousand.
  26. 26.Which is closest to 400 × 72? (Round each number first.) (a) 28000 (b) 280000 (c) 2800 (d) 56000
  27. 27.Which is closest to 105 + 901 + 99? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  28. 28.Which is closest to 2008 ÷ 39? (a) 100 (b) 50 (c) 500 (d) 25
  29. 29.Which is closest to 396 + 595 + 901? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  30. 30.Which is closest to 1809 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  31. 31.Round 86692 to the nearest ten.
  32. 32.Which is closest to 2693 ÷ 31? (a) 180 (b) 45 (c) 90 (d) 900
  33. 33.Round 35.42 to one decimal place. =
  34. 34.Which is closest to 1802 ÷ 29? (a) 60 (b) 600 (c) 120 (d) 30
  35. 35.Round 70.38 to one decimal place. =
  36. 36.Which is closest to 797 ÷ 21? (a) 80 (b) 40 (c) 400 (d) 20
  37. 37.Which is closest to 1191 ÷ 21? (a) 600 (b) 120 (c) 60 (d) 30
  38. 38.Round 29.69 to one decimal place. =
  39. 39.Round 83285 to the nearest thousand.
  40. 40.Which is closest to 400 + 702 + 195? (a) 1400 (b) 1200 (c) 1500 (d) 1300

Answer key

  1. 10000
  2. 33.8
  3. 25000
  4. 2300
  5. 68600
  6. 98100
  7. 10800
  8. 600
  9. 69300
  10. 40.9
  11. 18000
  12. 81.8
  13. 80.2
  14. 21000
  15. 70.4
  16. 1100
  17. 90
  18. 68700
  19. 49000
  20. 60
  21. 1500
  22. 2100
  23. 69.4
  24. 19420
  25. 3000
  26. 28000
  27. 1100
  28. 50
  29. 1900
  30. 60
  31. 86690
  32. 90
  33. 35.4
  34. 60
  35. 70.4
  36. 40
  37. 60
  38. 29.7
  39. 83000
  40. 1300

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