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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 440 · 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 87716 to the nearest hundred.
  2. 2.Which is closest to 1000 ÷ 49? (a) 40 (b) 20 (c) 10 (d) 200
  3. 3.Round 38722 to the nearest thousand.
  4. 4.Which is closest to 1592 ÷ 39? (a) 400 (b) 40 (c) 20 (d) 80
  5. 5.Round 61.76 to one decimal place. =
  6. 6.Which is closest to 899 × 18? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  7. 7.Which is closest to 297 × 22? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  8. 8.Round 16.72 to one decimal place. =
  9. 9.Round 58.24 to one decimal place. =
  10. 10.Which is closest to 204 × 92? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  11. 11.Which is closest to 805 + 305 + 304? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  12. 12.Which is closest to 102 + 96 + 602? (a) 900 (b) 700 (c) 1000 (d) 800
  13. 13.Round 16.48 to one decimal place. =
  14. 14.Which is closest to 901 + 896 + 504? (a) 2300 (b) 2500 (c) 2200 (d) 2400
  15. 15.Which is closest to 303 × 18? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  16. 16.Which is closest to 608 ÷ 21? (a) 30 (b) 15 (c) 60 (d) 300
  17. 17.Which is closest to 504 × 61? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
  18. 18.Which is closest to 800 + 899 + 603? (a) 2200 (b) 2500 (c) 2400 (d) 2300
  19. 19.Round 63153 to the nearest ten.
  20. 20.Round 92731 to the nearest hundred.
  21. 21.Round 71755 to the nearest thousand.
  22. 22.Round 65.47 to one decimal place. =
  23. 23.Round 29.94 to one decimal place. =
  24. 24.Which is closest to 3491 ÷ 49? (a) 35 (b) 140 (c) 700 (d) 70
  25. 25.Which is closest to 3607 ÷ 41? (a) 180 (b) 900 (c) 90 (d) 45
  26. 26.Which is closest to 196 × 89? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  27. 27.Round 86414 to the nearest thousand.
  28. 28.Which is closest to 896 + 502 + 700? (a) 2200 (b) 2100 (c) 2000 (d) 2300
  29. 29.Which is closest to 804 × 21? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  30. 30.Which is closest to 992 ÷ 21? (a) 50 (b) 100 (c) 25 (d) 500
  31. 31.Round 34.42 to one decimal place. =
  32. 32.Which is closest to 895 + 905 + 897? (a) 2700 (b) 2800 (c) 2900 (d) 2600
  33. 33.Which is closest to 2109 ÷ 29? (a) 700 (b) 140 (c) 70 (d) 35
  34. 34.Round 77.67 to one decimal place. =
  35. 35.Which is closest to 200 × 62? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  36. 36.Which is closest to 1600 ÷ 21? (a) 40 (b) 160 (c) 800 (d) 80
  37. 37.Round 18926 to the nearest thousand.
  38. 38.Round 98968 to the nearest thousand.
  39. 39.Round 77.81 to one decimal place. =
  40. 40.Which is closest to 497 × 32? (Round each number first.) (a) 15000 (b) 150000 (c) 30000 (d) 1500

Answer key

  1. 87700
  2. 20
  3. 39000
  4. 40
  5. 61.8
  6. 18000
  7. 6000
  8. 16.7
  9. 58.2
  10. 18000
  11. 1400
  12. 800
  13. 16.5
  14. 2300
  15. 6000
  16. 30
  17. 30000
  18. 2300
  19. 63150
  20. 92700
  21. 72000
  22. 65.5
  23. 29.9
  24. 70
  25. 90
  26. 18000
  27. 86000
  28. 2100
  29. 16000
  30. 50
  31. 34.4
  32. 2700
  33. 70
  34. 77.7
  35. 12000
  36. 80
  37. 19000
  38. 99000
  39. 77.8
  40. 15000

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