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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 824 · 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.Round 60231 to the nearest thousand.
  2. 2.Which is closest to 797 × 38? (Round each number first.) (a) 32000 (b) 3200 (c) 64000 (d) 320000
  3. 3.Round 54.56 to one decimal place. =
  4. 4.Round 24.17 to one decimal place. =
  5. 5.Which is closest to 2698 ÷ 29? (a) 900 (b) 180 (c) 90 (d) 45
  6. 6.Which is closest to 700 + 295 + 98? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  7. 7.Which is closest to 392 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200
  8. 8.Round 64.62 to one decimal place. =
  9. 9.Round 95965 to the nearest thousand.
  10. 10.Round 39313 to the nearest thousand.
  11. 11.Round 33072 to the nearest ten.
  12. 12.Which is closest to 1202 ÷ 29? (a) 20 (b) 40 (c) 400 (d) 80
  13. 13.Round 11.43 to one decimal place. =
  14. 14.Which is closest to 596 × 29? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  15. 15.Round 85591 to the nearest thousand.
  16. 16.Which is closest to 97 + 500 + 295? (a) 1000 (b) 900 (c) 1100 (d) 800
  17. 17.Round 13.38 to one decimal place. =
  18. 18.Which is closest to 1507 ÷ 29? (a) 100 (b) 500 (c) 25 (d) 50
  19. 19.Which is closest to 3206 ÷ 39? (a) 800 (b) 80 (c) 40 (d) 160
  20. 20.Round 21.44 to one decimal place. =
  21. 21.Which is closest to 297 + 297 + 97? (a) 800 (b) 600 (c) 700 (d) 900
  22. 22.Which is closest to 95 + 700 + 303? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  23. 23.Round 81.31 to one decimal place. =
  24. 24.Round 57412 to the nearest hundred.
  25. 25.Which is closest to 203 + 97 + 503? (a) 1000 (b) 900 (c) 700 (d) 800
  26. 26.Round 39.31 to one decimal place. =
  27. 27.Round 46727 to the nearest hundred.
  28. 28.Round 89260 to the nearest hundred.
  29. 29.Which is closest to 2500 ÷ 49? (a) 100 (b) 25 (c) 500 (d) 50
  30. 30.Which is closest to 902 × 49? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
  31. 31.Which is closest to 598 × 89? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  32. 32.Which is closest to 301 + 795 + 99? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  33. 33.Which is closest to 3207 ÷ 41? (a) 40 (b) 800 (c) 80 (d) 160
  34. 34.Round 56.86 to one decimal place. =
  35. 35.Round 35.88 to one decimal place. =
  36. 36.Which is closest to 2397 ÷ 29? (a) 160 (b) 80 (c) 40 (d) 800
  37. 37.Which is closest to 697 × 18? (Round each number first.) (a) 28000 (b) 1400 (c) 140000 (d) 14000
  38. 38.Round 65.42 to one decimal place. =
  39. 39.Round 5295 to the nearest thousand.
  40. 40.Which is closest to 1491 ÷ 29? (a) 500 (b) 100 (c) 25 (d) 50

Answer key

  1. 60000
  2. 32000
  3. 54.6
  4. 24.2
  5. 90
  6. 1100
  7. 20
  8. 64.6
  9. 96000
  10. 39000
  11. 33070
  12. 40
  13. 11.4
  14. 18000
  15. 86000
  16. 900
  17. 13.4
  18. 50
  19. 80
  20. 21.4
  21. 700
  22. 1100
  23. 81.3
  24. 57400
  25. 800
  26. 39.3
  27. 46700
  28. 89300
  29. 50
  30. 45000
  31. 54000
  32. 1200
  33. 80
  34. 56.9
  35. 35.9
  36. 80
  37. 14000
  38. 65.4
  39. 5000
  40. 50

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