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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 952 · 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 701 × 22? (Round each number first.) (a) 28000 (b) 14000 (c) 1400 (d) 140000
  2. 2.Which is closest to 803 × 30? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  3. 3.Which is closest to 797 × 29? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  4. 4.Which is closest to 197 + 599 + 600? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  5. 5.Which is closest to 803 × 88? (Round each number first.) (a) 144000 (b) 7200 (c) 72000 (d) 720000
  6. 6.Round 87494 to the nearest hundred.
  7. 7.Which is closest to 2008 ÷ 51? (a) 40 (b) 400 (c) 20 (d) 80
  8. 8.Round 25161 to the nearest ten.
  9. 9.Which is closest to 1591 ÷ 39? (a) 400 (b) 40 (c) 80 (d) 20
  10. 10.Round 48552 to the nearest thousand.
  11. 11.Round 26933 to the nearest hundred.
  12. 12.Round 26.81 to one decimal place. =
  13. 13.Round 39.47 to one decimal place. =
  14. 14.Which is closest to 397 × 29? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  15. 15.Which is closest to 302 + 898 + 404? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  16. 16.Which is closest to 701 + 799 + 795? (a) 2200 (b) 2400 (c) 2500 (d) 2300
  17. 17.Which is closest to 599 × 31? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  18. 18.Which is closest to 796 + 495 + 504? (a) 1800 (b) 2000 (c) 1900 (d) 1700
  19. 19.Which is closest to 996 ÷ 21? (a) 500 (b) 100 (c) 25 (d) 50
  20. 20.Round 25.47 to one decimal place. =
  21. 21.Round 45.13 to one decimal place. =
  22. 22.Which is closest to 404 × 71? (Round each number first.) (a) 56000 (b) 280000 (c) 28000 (d) 2800
  23. 23.Which is closest to 301 + 298 + 696? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  24. 24.Round 90.07 to one decimal place. =
  25. 25.Which is closest to 497 × 28? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
  26. 26.Which is closest to 404 × 39? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  27. 27.Which is closest to 1004 ÷ 21? (a) 100 (b) 50 (c) 25 (d) 500
  28. 28.Round 56.23 to one decimal place. =
  29. 29.Which is closest to 401 + 402 + 500? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  30. 30.Round 82354 to the nearest hundred.
  31. 31.Which is closest to 104 + 901 + 695? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  32. 32.Round 81895 to the nearest hundred.
  33. 33.Which is closest to 504 × 89? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  34. 34.Round 38827 to the nearest ten.
  35. 35.Round 43.81 to one decimal place. =
  36. 36.Round 96906 to the nearest ten.
  37. 37.Which is closest to 402 × 69? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  38. 38.Which is closest to 105 + 497 + 702? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  39. 39.Which is closest to 1491 ÷ 51? (a) 60 (b) 15 (c) 300 (d) 30
  40. 40.Which is closest to 804 + 796 + 299? (a) 1800 (b) 1900 (c) 2000 (d) 2100

Answer key

  1. 14000
  2. 24000
  3. 24000
  4. 1400
  5. 72000
  6. 87500
  7. 40
  8. 25160
  9. 40
  10. 49000
  11. 26900
  12. 26.8
  13. 39.5
  14. 12000
  15. 1600
  16. 2300
  17. 18000
  18. 1800
  19. 50
  20. 25.5
  21. 45.1
  22. 28000
  23. 1300
  24. 90.1
  25. 15000
  26. 16000
  27. 50
  28. 56.2
  29. 1300
  30. 82400
  31. 1700
  32. 81900
  33. 45000
  34. 38830
  35. 43.8
  36. 96910
  37. 28000
  38. 1300
  39. 30
  40. 1900

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