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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 86 · 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 69.83 to one decimal place. =
  2. 2.Which is closest to 596 + 297 + 897? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  3. 3.Which is closest to 298 × 69? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000
  4. 4.Which is closest to 297 × 68? (Round each number first.) (a) 42000 (b) 2100 (c) 210000 (d) 21000
  5. 5.Which is closest to 697 × 30? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000
  6. 6.Round 42.28 to one decimal place. =
  7. 7.Which is closest to 603 + 796 + 499? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  8. 8.Round 46.22 to one decimal place. =
  9. 9.Round 28.29 to one decimal place. =
  10. 10.Round 11578 to the nearest hundred.
  11. 11.Which is closest to 802 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  12. 12.Which is closest to 2793 ÷ 41? (a) 140 (b) 35 (c) 70 (d) 700
  13. 13.Which is closest to 1491 ÷ 49? (a) 60 (b) 15 (c) 300 (d) 30
  14. 14.Round 62.46 to one decimal place. =
  15. 15.Which is closest to 695 + 896 + 896? (a) 2700 (b) 2600 (c) 2500 (d) 2400
  16. 16.Round 82589 to the nearest ten.
  17. 17.Which is closest to 302 × 29? (Round each number first.) (a) 90000 (b) 900 (c) 9000 (d) 18000
  18. 18.Which is closest to 596 × 72? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  19. 19.Round 28756 to the nearest ten.
  20. 20.Which is closest to 4507 ÷ 51? (a) 180 (b) 90 (c) 900 (d) 45
  21. 21.Round 56193 to the nearest ten.
  22. 22.Round 73735 to the nearest hundred.
  23. 23.Which is closest to 998 ÷ 19? (a) 100 (b) 500 (c) 50 (d) 25
  24. 24.Which is closest to 796 × 89? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  25. 25.Which is closest to 2392 ÷ 31? (a) 800 (b) 160 (c) 40 (d) 80
  26. 26.Which is closest to 898 × 39? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  27. 27.Round 25.09 to one decimal place. =
  28. 28.Which is closest to 295 + 98 + 805? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  29. 29.Which is closest to 803 × 38? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  30. 30.Which is closest to 303 + 198 + 404? (a) 1100 (b) 800 (c) 900 (d) 1000
  31. 31.Round 11.76 to one decimal place. =
  32. 32.Which is closest to 205 + 196 + 600? (a) 1000 (b) 1200 (c) 1100 (d) 900
  33. 33.Which is closest to 797 + 502 + 300? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  34. 34.Which is closest to 603 × 60? (Round each number first.) (a) 36000 (b) 360000 (c) 3600 (d) 72000
  35. 35.Round 7683 to the nearest hundred.
  36. 36.Round 80977 to the nearest ten.
  37. 37.Round 24351 to the nearest thousand.
  38. 38.Which is closest to 297 + 200 + 897? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  39. 39.Round 77.38 to one decimal place. =
  40. 40.Which is closest to 105 + 902 + 303? (a) 1400 (b) 1300 (c) 1500 (d) 1200

Answer key

  1. 69.8
  2. 1800
  3. 21000
  4. 21000
  5. 21000
  6. 42.3
  7. 1900
  8. 46.2
  9. 28.3
  10. 11600
  11. 16000
  12. 70
  13. 30
  14. 62.5
  15. 2500
  16. 82590
  17. 9000
  18. 42000
  19. 28760
  20. 90
  21. 56190
  22. 73700
  23. 50
  24. 72000
  25. 80
  26. 36000
  27. 25.1
  28. 1200
  29. 32000
  30. 900
  31. 11.8
  32. 1000
  33. 1600
  34. 36000
  35. 7700
  36. 80980
  37. 24000
  38. 1400
  39. 77.4
  40. 1300

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