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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 506 · 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 503 × 40? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  2. 2.Which is closest to 500 + 105 + 205? (a) 700 (b) 800 (c) 1000 (d) 900
  3. 3.Which is closest to 2493 ÷ 49? (a) 50 (b) 100 (c) 25 (d) 500
  4. 4.Round 48222 to the nearest thousand.
  5. 5.Round 92.63 to one decimal place. =
  6. 6.Round 32122 to the nearest thousand.
  7. 7.Which is closest to 3202 ÷ 41? (a) 80 (b) 160 (c) 40 (d) 800
  8. 8.Which is closest to 501 × 70? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  9. 9.Which is closest to 1192 ÷ 21? (a) 30 (b) 120 (c) 60 (d) 600
  10. 10.Round 10.26 to one decimal place. =
  11. 11.Which is closest to 901 × 68? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  12. 12.Which is closest to 705 + 404 + 97? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  13. 13.Which is closest to 697 + 603 + 401? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  14. 14.Round 70.87 to one decimal place. =
  15. 15.Which is closest to 703 + 299 + 695? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  16. 16.Which is closest to 295 + 897 + 196? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  17. 17.Round 14.18 to one decimal place. =
  18. 18.Round 21.24 to one decimal place. =
  19. 19.Round 16.57 to one decimal place. =
  20. 20.Round 26.52 to one decimal place. =
  21. 21.Round 95.13 to one decimal place. =
  22. 22.Round 54.32 to one decimal place. =
  23. 23.Round 83041 to the nearest ten.
  24. 24.Which is closest to 904 × 38? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  25. 25.Round 52936 to the nearest hundred.
  26. 26.Round 97.93 to one decimal place. =
  27. 27.Which is closest to 402 × 59? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  28. 28.Round 21995 to the nearest thousand.
  29. 29.Which is closest to 202 + 604 + 203? (a) 1000 (b) 1200 (c) 900 (d) 1100
  30. 30.Which is closest to 704 × 72? (Round each number first.) (a) 490000 (b) 49000 (c) 4900 (d) 98000
  31. 31.Which is closest to 704 + 101 + 403? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  32. 32.Which is closest to 297 × 49? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  33. 33.Which is closest to 805 + 397 + 905? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  34. 34.Which is closest to 405 + 905 + 397? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  35. 35.Which is closest to 1201 ÷ 31? (a) 40 (b) 20 (c) 80 (d) 400
  36. 36.Round 47.94 to one decimal place. =
  37. 37.Which is closest to 2797 ÷ 39? (a) 35 (b) 140 (c) 700 (d) 70
  38. 38.Which is closest to 600 + 900 + 603? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  39. 39.Which is closest to 495 + 798 + 798? (a) 2000 (b) 2300 (c) 2200 (d) 2100
  40. 40.Which is closest to 705 + 95 + 496? (a) 1400 (b) 1500 (c) 1200 (d) 1300

Answer key

  1. 20000
  2. 800
  3. 50
  4. 48000
  5. 92.6
  6. 32000
  7. 80
  8. 35000
  9. 60
  10. 10.3
  11. 63000
  12. 1200
  13. 1700
  14. 70.9
  15. 1700
  16. 1400
  17. 14.2
  18. 21.2
  19. 16.6
  20. 26.5
  21. 95.1
  22. 54.3
  23. 83040
  24. 36000
  25. 52900
  26. 97.9
  27. 24000
  28. 22000
  29. 1000
  30. 49000
  31. 1200
  32. 15000
  33. 2100
  34. 1700
  35. 40
  36. 47.9
  37. 70
  38. 2100
  39. 2100
  40. 1300

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