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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 336 · 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 44.43 to one decimal place. =
  2. 2.Which is closest to 799 + 696 + 799? (a) 2300 (b) 2400 (c) 2200 (d) 2500
  3. 3.Which is closest to 1009 ÷ 19? (a) 500 (b) 50 (c) 25 (d) 100
  4. 4.Which is closest to 899 × 18? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  5. 5.Which is closest to 798 × 91? (Round each number first.) (a) 720000 (b) 144000 (c) 7200 (d) 72000
  6. 6.Which is closest to 397 + 401 + 903? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  7. 7.Which is closest to 902 + 795 + 603? (a) 2300 (b) 2200 (c) 2500 (d) 2400
  8. 8.Which is closest to 96 + 98 + 198? (a) 300 (b) 500 (c) 600 (d) 400
  9. 9.Which is closest to 204 × 50? (Round each number first.) (a) 10000 (b) 20000 (c) 100000 (d) 1000
  10. 10.Round 49.08 to one decimal place. =
  11. 11.Which is closest to 603 × 59? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  12. 12.Which is closest to 1393 ÷ 19? (a) 700 (b) 35 (c) 140 (d) 70
  13. 13.Which is closest to 304 × 88? (Round each number first.) (a) 2700 (b) 54000 (c) 270000 (d) 27000
  14. 14.Round 37.71 to one decimal place. =
  15. 15.Round 76820 to the nearest thousand.
  16. 16.Which is closest to 297 + 604 + 904? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  17. 17.Round 48.87 to one decimal place. =
  18. 18.Round 79.53 to one decimal place. =
  19. 19.Round 47658 to the nearest thousand.
  20. 20.Round 60.61 to one decimal place. =
  21. 21.Which is closest to 2407 ÷ 31? (a) 40 (b) 160 (c) 80 (d) 800
  22. 22.Which is closest to 900 × 29? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  23. 23.Which is closest to 898 × 28? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000
  24. 24.Which is closest to 903 × 19? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  25. 25.Round 45.54 to one decimal place. =
  26. 26.Which is closest to 904 × 49? (Round each number first.) (a) 45000 (b) 450000 (c) 90000 (d) 4500
  27. 27.Round 63.76 to one decimal place. =
  28. 28.Which is closest to 97 + 403 + 98? (a) 800 (b) 500 (c) 700 (d) 600
  29. 29.Which is closest to 302 × 38? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  30. 30.Round 58.72 to one decimal place. =
  31. 31.Round 87071 to the nearest thousand.
  32. 32.Which is closest to 600 ÷ 21? (a) 300 (b) 60 (c) 15 (d) 30
  33. 33.Which is closest to 301 + 496 + 696? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  34. 34.Which is closest to 704 + 505 + 297? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  35. 35.Which is closest to 403 × 18? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
  36. 36.Which is closest to 1396 ÷ 21? (a) 70 (b) 140 (c) 700 (d) 35
  37. 37.Round 91.56 to one decimal place. =
  38. 38.Round 45.68 to one decimal place. =
  39. 39.Which is closest to 297 + 195 + 100? (a) 800 (b) 700 (c) 500 (d) 600
  40. 40.Round 46925 to the nearest thousand.

Answer key

  1. 44.4
  2. 2300
  3. 50
  4. 18000
  5. 72000
  6. 1700
  7. 2300
  8. 400
  9. 10000
  10. 49.1
  11. 36000
  12. 70
  13. 27000
  14. 37.7
  15. 77000
  16. 1800
  17. 48.9
  18. 79.5
  19. 48000
  20. 60.6
  21. 80
  22. 27000
  23. 27000
  24. 18000
  25. 45.5
  26. 45000
  27. 63.8
  28. 600
  29. 12000
  30. 58.7
  31. 87000
  32. 30
  33. 1500
  34. 1500
  35. 8000
  36. 70
  37. 91.6
  38. 45.7
  39. 600
  40. 47000

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