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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 296 · 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 403 × 59? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  2. 2.Which is closest to 807 ÷ 19? (a) 20 (b) 400 (c) 40 (d) 80
  3. 3.Which is closest to 898 × 51? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  4. 4.Which is closest to 697 × 28? (Round each number first.) (a) 2100 (b) 21000 (c) 210000 (d) 42000
  5. 5.Round 83.94 to one decimal place. =
  6. 6.Round 78616 to the nearest ten.
  7. 7.Which is closest to 196 + 199 + 895? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  8. 8.Which is closest to 2696 ÷ 31? (a) 900 (b) 45 (c) 90 (d) 180
  9. 9.Which is closest to 304 + 597 + 499? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  10. 10.Which is closest to 800 × 68? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  11. 11.Which is closest to 598 × 71? (Round each number first.) (a) 84000 (b) 420000 (c) 4200 (d) 42000
  12. 12.Which is closest to 202 × 92? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  13. 13.Which is closest to 897 × 72? (Round each number first.) (a) 126000 (b) 630000 (c) 63000 (d) 6300
  14. 14.Round 30998 to the nearest thousand.
  15. 15.Which is closest to 196 + 501 + 805? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  16. 16.Which is closest to 2804 ÷ 39? (a) 35 (b) 70 (c) 140 (d) 700
  17. 17.Round 82281 to the nearest ten.
  18. 18.Round 89.28 to one decimal place. =
  19. 19.Round 21928 to the nearest thousand.
  20. 20.Which is closest to 905 + 903 + 904? (a) 2900 (b) 2700 (c) 2800 (d) 2600
  21. 21.Which is closest to 499 + 796 + 98? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  22. 22.Round 52144 to the nearest thousand.
  23. 23.Round 10.51 to one decimal place. =
  24. 24.Which is closest to 297 × 41? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  25. 25.Which is closest to 791 ÷ 39? (a) 20 (b) 40 (c) 10 (d) 200
  26. 26.Which is closest to 896 × 41? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  27. 27.Round 23.73 to one decimal place. =
  28. 28.Round 70.17 to one decimal place. =
  29. 29.Which is closest to 904 × 90? (Round each number first.) (a) 810000 (b) 8100 (c) 81000 (d) 162000
  30. 30.Which is closest to 201 × 42? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  31. 31.Which is closest to 1503 ÷ 49? (a) 60 (b) 15 (c) 300 (d) 30
  32. 32.Which is closest to 296 × 88? (Round each number first.) (a) 2700 (b) 54000 (c) 270000 (d) 27000
  33. 33.Round 46.13 to one decimal place. =
  34. 34.Which is closest to 803 × 50? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  35. 35.Round 83.73 to one decimal place. =
  36. 36.Which is closest to 700 × 41? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  37. 37.Round 22.21 to one decimal place. =
  38. 38.Round 16029 to the nearest thousand.
  39. 39.Round 86.46 to one decimal place. =
  40. 40.Which is closest to 302 + 95 + 400? (a) 1000 (b) 900 (c) 700 (d) 800

Answer key

  1. 24000
  2. 40
  3. 45000
  4. 21000
  5. 83.9
  6. 78620
  7. 1300
  8. 90
  9. 1400
  10. 56000
  11. 42000
  12. 18000
  13. 63000
  14. 31000
  15. 1500
  16. 70
  17. 82280
  18. 89.3
  19. 22000
  20. 2700
  21. 1400
  22. 52000
  23. 10.5
  24. 12000
  25. 20
  26. 36000
  27. 23.7
  28. 70.2
  29. 81000
  30. 8000
  31. 30
  32. 27000
  33. 46.1
  34. 40000
  35. 83.7
  36. 28000
  37. 22.2
  38. 16000
  39. 86.5
  40. 800

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