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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 981 · 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 18.91 to one decimal place. =
  2. 2.Round 50.27 to one decimal place. =
  3. 3.Which is closest to 196 × 71? (Round each number first.) (a) 28000 (b) 1400 (c) 140000 (d) 14000
  4. 4.Which is closest to 196 × 21? (Round each number first.) (a) 4000 (b) 40000 (c) 8000 (d) 400
  5. 5.Round 31.88 to one decimal place. =
  6. 6.Round 94569 to the nearest hundred.
  7. 7.Which is closest to 3493 ÷ 49? (a) 70 (b) 35 (c) 140 (d) 700
  8. 8.Which is closest to 2407 ÷ 29? (a) 800 (b) 80 (c) 160 (d) 40
  9. 9.Round 32.48 to one decimal place. =
  10. 10.Which is closest to 1801 ÷ 19? (a) 180 (b) 45 (c) 900 (d) 90
  11. 11.Round 19818 to the nearest thousand.
  12. 12.Which is closest to 3004 ÷ 51? (a) 120 (b) 60 (c) 30 (d) 600
  13. 13.Which is closest to 701 × 89? (Round each number first.) (a) 6300 (b) 630000 (c) 126000 (d) 63000
  14. 14.Which is closest to 3200 ÷ 39? (a) 40 (b) 80 (c) 800 (d) 160
  15. 15.Round 16.39 to one decimal place. =
  16. 16.Which is closest to 302 × 21? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  17. 17.Which is closest to 898 + 95 + 799? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  18. 18.Round 59.83 to one decimal place. =
  19. 19.Which is closest to 895 + 596 + 401? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  20. 20.Round 96.93 to one decimal place. =
  21. 21.Which is closest to 1206 ÷ 41? (a) 300 (b) 15 (c) 30 (d) 60
  22. 22.Round 87.21 to one decimal place. =
  23. 23.Which is closest to 402 × 30? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  24. 24.Which is closest to 305 + 805 + 605? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  25. 25.Which is closest to 600 × 59? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  26. 26.Which is closest to 597 + 96 + 396? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  27. 27.Which is closest to 398 × 22? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
  28. 28.Which is closest to 700 × 89? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  29. 29.Round 37.28 to one decimal place. =
  30. 30.Which is closest to 2400 ÷ 41? (a) 60 (b) 30 (c) 600 (d) 120
  31. 31.Which is closest to 4507 ÷ 49? (a) 180 (b) 900 (c) 90 (d) 45
  32. 32.Which is closest to 302 × 40? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  33. 33.Which is closest to 99 + 101 + 797? (a) 900 (b) 1200 (c) 1100 (d) 1000
  34. 34.Round 19165 to the nearest hundred.
  35. 35.Which is closest to 304 + 305 + 404? (a) 1100 (b) 1000 (c) 900 (d) 1200
  36. 36.Round 35.29 to one decimal place. =
  37. 37.Which is closest to 3002 ÷ 51? (a) 60 (b) 600 (c) 30 (d) 120
  38. 38.Which is closest to 402 ÷ 21? (a) 10 (b) 40 (c) 200 (d) 20
  39. 39.Round 13.12 to one decimal place. =
  40. 40.Which is closest to 695 + 401 + 497? (a) 1800 (b) 1500 (c) 1700 (d) 1600

Answer key

  1. 18.9
  2. 50.3
  3. 14000
  4. 4000
  5. 31.9
  6. 94600
  7. 70
  8. 80
  9. 32.5
  10. 90
  11. 20000
  12. 60
  13. 63000
  14. 80
  15. 16.4
  16. 6000
  17. 1800
  18. 59.8
  19. 1900
  20. 96.9
  21. 30
  22. 87.2
  23. 12000
  24. 1700
  25. 36000
  26. 1100
  27. 8000
  28. 63000
  29. 37.3
  30. 60
  31. 90
  32. 12000
  33. 1000
  34. 19200
  35. 1000
  36. 35.3
  37. 60
  38. 20
  39. 13.1
  40. 1600

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