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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 799 · 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 897 × 78? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  2. 2.Which is closest to 502 + 198 + 596? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  3. 3.Which is closest to 401 ÷ 21? (a) 40 (b) 10 (c) 200 (d) 20
  4. 4.Round 90.42 to one decimal place. =
  5. 5.Round 72.28 to one decimal place. =
  6. 6.Round 70.64 to one decimal place. =
  7. 7.Which is closest to 305 + 504 + 304? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  8. 8.Which is closest to 601 × 29? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  9. 9.Which is closest to 503 + 704 + 901? (a) 2200 (b) 2000 (c) 2100 (d) 2300
  10. 10.Round 86.64 to one decimal place. =
  11. 11.Round 33503 to the nearest ten.
  12. 12.Round 41469 to the nearest hundred.
  13. 13.Round 25.87 to one decimal place. =
  14. 14.Which is closest to 302 × 88? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  15. 15.Round 91.71 to one decimal place. =
  16. 16.Round 46.17 to one decimal place. =
  17. 17.Round 60631 to the nearest hundred.
  18. 18.Which is closest to 998 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
  19. 19.Round 27.43 to one decimal place. =
  20. 20.Round 64.77 to one decimal place. =
  21. 21.Which is closest to 904 + 298 + 198? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  22. 22.Which is closest to 601 + 202 + 396? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  23. 23.Which is closest to 595 ÷ 21? (a) 60 (b) 30 (c) 15 (d) 300
  24. 24.Which is closest to 198 × 70? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  25. 25.Which is closest to 3495 ÷ 51? (a) 140 (b) 35 (c) 70 (d) 700
  26. 26.Which is closest to 399 × 89? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  27. 27.Round 49637 to the nearest ten.
  28. 28.Round 62.74 to one decimal place. =
  29. 29.Which is closest to 398 + 895 + 603? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  30. 30.Round 8465 to the nearest thousand.
  31. 31.Which is closest to 794 ÷ 21? (a) 20 (b) 80 (c) 40 (d) 400
  32. 32.Which is closest to 896 × 82? (Round each number first.) (a) 7200 (b) 144000 (c) 720000 (d) 72000
  33. 33.Round 63349 to the nearest ten.
  34. 34.Which is closest to 303 × 31? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
  35. 35.Round 93.23 to one decimal place. =
  36. 36.Which is closest to 2704 ÷ 29? (a) 45 (b) 180 (c) 900 (d) 90
  37. 37.Which is closest to 404 + 704 + 899? (a) 2000 (b) 1900 (c) 2200 (d) 2100
  38. 38.Which is closest to 602 × 49? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  39. 39.Which is closest to 497 × 39? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  40. 40.Which is closest to 2707 ÷ 31? (a) 180 (b) 90 (c) 900 (d) 45

Answer key

  1. 72000
  2. 1300
  3. 20
  4. 90.4
  5. 72.3
  6. 70.6
  7. 1100
  8. 18000
  9. 2100
  10. 86.6
  11. 33500
  12. 41500
  13. 25.9
  14. 27000
  15. 91.7
  16. 46.2
  17. 60600
  18. 20
  19. 27.4
  20. 64.8
  21. 1400
  22. 1200
  23. 30
  24. 14000
  25. 70
  26. 36000
  27. 49640
  28. 62.7
  29. 1900
  30. 8000
  31. 40
  32. 72000
  33. 63350
  34. 9000
  35. 93.2
  36. 90
  37. 2000
  38. 30000
  39. 20000
  40. 90

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