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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 489 · 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 197 × 40? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
  2. 2.Which is closest to 998 ÷ 49? (a) 40 (b) 200 (c) 10 (d) 20
  3. 3.Which is closest to 301 × 22? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
  4. 4.Round 72.83 to one decimal place. =
  5. 5.Which is closest to 402 × 68? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  6. 6.Round 25.49 to one decimal place. =
  7. 7.Round 22.74 to one decimal place. =
  8. 8.Round 79.48 to one decimal place. =
  9. 9.Which is closest to 799 × 89? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  10. 10.Which is closest to 796 + 900 + 900? (a) 2800 (b) 2500 (c) 2700 (d) 2600
  11. 11.Round 32.77 to one decimal place. =
  12. 12.Which is closest to 602 × 42? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  13. 13.Which is closest to 1392 ÷ 21? (a) 140 (b) 70 (c) 35 (d) 700
  14. 14.Which is closest to 502 + 96 + 200? (a) 800 (b) 1000 (c) 700 (d) 900
  15. 15.Which is closest to 700 × 79? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  16. 16.Round 52.32 to one decimal place. =
  17. 17.Which is closest to 898 ÷ 31? (a) 30 (b) 15 (c) 300 (d) 60
  18. 18.Which is closest to 799 × 40? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  19. 19.Which is closest to 104 + 300 + 703? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  20. 20.Which is closest to 204 × 51? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  21. 21.Round 21.29 to one decimal place. =
  22. 22.Round 18826 to the nearest hundred.
  23. 23.Which is closest to 605 + 704 + 904? (a) 2100 (b) 2200 (c) 2300 (d) 2400
  24. 24.Which is closest to 303 × 30? (Round each number first.) (a) 90000 (b) 900 (c) 9000 (d) 18000
  25. 25.Which is closest to 101 + 604 + 303? (a) 1100 (b) 1000 (c) 900 (d) 1200
  26. 26.Round 45.28 to one decimal place. =
  27. 27.Which is closest to 304 + 796 + 495? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  28. 28.Round 45.34 to one decimal place. =
  29. 29.Round 12.58 to one decimal place. =
  30. 30.Which is closest to 697 × 88? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
  31. 31.Which is closest to 905 + 202 + 604? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  32. 32.Which is closest to 1599 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  33. 33.Which is closest to 504 + 302 + 304? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  34. 34.Which is closest to 1603 ÷ 19? (a) 800 (b) 160 (c) 40 (d) 80
  35. 35.Which is closest to 303 × 60? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  36. 36.Which is closest to 496 + 96 + 904? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  37. 37.Which is closest to 304 × 18? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  38. 38.Round 71.26 to one decimal place. =
  39. 39.Which is closest to 303 × 61? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  40. 40.Round 92.17 to one decimal place. =

Answer key

  1. 8000
  2. 20
  3. 6000
  4. 72.8
  5. 28000
  6. 25.5
  7. 22.7
  8. 79.5
  9. 72000
  10. 2600
  11. 32.8
  12. 24000
  13. 70
  14. 800
  15. 56000
  16. 52.3
  17. 30
  18. 32000
  19. 1100
  20. 10000
  21. 21.3
  22. 18800
  23. 2200
  24. 9000
  25. 1000
  26. 45.3
  27. 1600
  28. 45.3
  29. 12.6
  30. 63000
  31. 1700
  32. 40
  33. 1100
  34. 80
  35. 18000
  36. 1500
  37. 6000
  38. 71.3
  39. 18000
  40. 92.2

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