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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 639 · 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 4497 ÷ 51? (a) 90 (b) 180 (c) 45 (d) 900
  2. 2.Round 18.47 to one decimal place. =
  3. 3.Round 91174 to the nearest hundred.
  4. 4.Which is closest to 1997 ÷ 51? (a) 400 (b) 80 (c) 20 (d) 40
  5. 5.Which is closest to 199 × 78? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  6. 6.Which is closest to 995 ÷ 21? (a) 100 (b) 25 (c) 500 (d) 50
  7. 7.Round 77.93 to one decimal place. =
  8. 8.Which is closest to 898 × 41? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  9. 9.Round 24.86 to one decimal place. =
  10. 10.Which is closest to 300 + 598 + 395? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  11. 11.Which is closest to 1003 ÷ 19? (a) 25 (b) 500 (c) 50 (d) 100
  12. 12.Which is closest to 704 × 81? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  13. 13.Which is closest to 2005 ÷ 49? (a) 400 (b) 20 (c) 80 (d) 40
  14. 14.Round 92.48 to one decimal place. =
  15. 15.Which is closest to 601 × 22? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  16. 16.Round 82151 to the nearest ten.
  17. 17.Round 58477 to the nearest ten.
  18. 18.Round 42379 to the nearest hundred.
  19. 19.Which is closest to 1199 ÷ 39? (a) 60 (b) 300 (c) 30 (d) 15
  20. 20.Round 25.92 to one decimal place. =
  21. 21.Which is closest to 1000 ÷ 51? (a) 40 (b) 200 (c) 20 (d) 10
  22. 22.Round 28.67 to one decimal place. =
  23. 23.Which is closest to 901 × 21? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  24. 24.Which is closest to 1998 ÷ 41? (a) 500 (b) 50 (c) 25 (d) 100
  25. 25.Which is closest to 797 ÷ 41? (a) 20 (b) 10 (c) 200 (d) 40
  26. 26.Which is closest to 1994 ÷ 41? (a) 500 (b) 50 (c) 25 (d) 100
  27. 27.Which is closest to 604 × 59? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
  28. 28.Which is closest to 201 × 21? (Round each number first.) (a) 400 (b) 4000 (c) 8000 (d) 40000
  29. 29.Round 83.43 to one decimal place. =
  30. 30.Round 13.92 to one decimal place. =
  31. 31.Which is closest to 700 + 105 + 301? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  32. 32.Which is closest to 1198 ÷ 29? (a) 40 (b) 80 (c) 400 (d) 20
  33. 33.Which is closest to 701 × 18? (Round each number first.) (a) 28000 (b) 140000 (c) 1400 (d) 14000
  34. 34.Which is closest to 4504 ÷ 49? (a) 45 (b) 180 (c) 900 (d) 90
  35. 35.Which is closest to 1496 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
  36. 36.Which is closest to 704 × 29? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  37. 37.Round 6461 to the nearest ten.
  38. 38.Which is closest to 400 × 61? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  39. 39.Round 71.94 to one decimal place. =
  40. 40.Round 73.81 to one decimal place. =

Answer key

  1. 90
  2. 18.5
  3. 91200
  4. 40
  5. 16000
  6. 50
  7. 77.9
  8. 36000
  9. 24.9
  10. 1300
  11. 50
  12. 56000
  13. 40
  14. 92.5
  15. 12000
  16. 82150
  17. 58480
  18. 42400
  19. 30
  20. 25.9
  21. 20
  22. 28.7
  23. 18000
  24. 50
  25. 20
  26. 50
  27. 36000
  28. 4000
  29. 83.4
  30. 13.9
  31. 1100
  32. 40
  33. 14000
  34. 90
  35. 50
  36. 21000
  37. 6460
  38. 24000
  39. 71.9
  40. 73.8

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