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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 468 · 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 791 ÷ 41? (a) 20 (b) 200 (c) 10 (d) 40
  2. 2.Round 25662 to the nearest ten.
  3. 3.Which is closest to 500 + 296 + 304? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  4. 4.Which is closest to 596 × 20? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  5. 5.Round 75.17 to one decimal place. =
  6. 6.Which is closest to 203 × 29? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000
  7. 7.Which is closest to 502 × 29? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  8. 8.Which is closest to 701 + 804 + 103? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  9. 9.Which is closest to 904 ÷ 29? (a) 300 (b) 60 (c) 30 (d) 15
  10. 10.Which is closest to 703 × 30? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  11. 11.Which is closest to 704 × 68? (Round each number first.) (a) 49000 (b) 490000 (c) 4900 (d) 98000
  12. 12.Which is closest to 809 ÷ 39? (a) 40 (b) 20 (c) 10 (d) 200
  13. 13.Which is closest to 699 × 28? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  14. 14.Which is closest to 1192 ÷ 39? (a) 30 (b) 15 (c) 60 (d) 300
  15. 15.Which is closest to 702 × 92? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  16. 16.Round 26.24 to one decimal place. =
  17. 17.Which is closest to 599 × 80? (Round each number first.) (a) 480000 (b) 48000 (c) 96000 (d) 4800
  18. 18.Round 59.27 to one decimal place. =
  19. 19.Which is closest to 3592 ÷ 41? (a) 45 (b) 90 (c) 900 (d) 180
  20. 20.Round 50.89 to one decimal place. =
  21. 21.Round 21.36 to one decimal place. =
  22. 22.Round 63.94 to one decimal place. =
  23. 23.Round 80858 to the nearest ten.
  24. 24.Which is closest to 300 × 18? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  25. 25.Round 86.37 to one decimal place. =
  26. 26.Round 49.56 to one decimal place. =
  27. 27.Round 47.47 to one decimal place. =
  28. 28.Round 73647 to the nearest thousand.
  29. 29.Round 38015 to the nearest thousand.
  30. 30.Which is closest to 802 + 495 + 99? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  31. 31.Round 18786 to the nearest thousand.
  32. 32.Round 87.48 to one decimal place. =
  33. 33.Which is closest to 297 + 301 + 695? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  34. 34.Which is closest to 597 × 28? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  35. 35.Which is closest to 799 × 19? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  36. 36.Which is closest to 2004 ÷ 39? (a) 50 (b) 500 (c) 100 (d) 25
  37. 37.Which is closest to 1508 ÷ 31? (a) 100 (b) 50 (c) 25 (d) 500
  38. 38.Which is closest to 95 + 704 + 296? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  39. 39.Which is closest to 396 × 38? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  40. 40.Which is closest to 2499 ÷ 49? (a) 50 (b) 100 (c) 500 (d) 25

Answer key

  1. 20
  2. 25660
  3. 1100
  4. 12000
  5. 75.2
  6. 6000
  7. 15000
  8. 1600
  9. 30
  10. 21000
  11. 49000
  12. 20
  13. 21000
  14. 30
  15. 63000
  16. 26.2
  17. 48000
  18. 59.3
  19. 90
  20. 50.9
  21. 21.4
  22. 63.9
  23. 80860
  24. 6000
  25. 86.4
  26. 49.6
  27. 47.5
  28. 74000
  29. 38000
  30. 1400
  31. 19000
  32. 87.5
  33. 1300
  34. 18000
  35. 16000
  36. 50
  37. 50
  38. 1100
  39. 16000
  40. 50

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