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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 851 · 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 25186 to the nearest ten.
  2. 2.Which is closest to 1492 ÷ 49? (a) 15 (b) 60 (c) 30 (d) 300
  3. 3.Round 52.31 to one decimal place. =
  4. 4.Round 14.12 to one decimal place. =
  5. 5.Round 35994 to the nearest ten.
  6. 6.Which is closest to 300 + 705 + 796? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  7. 7.Which is closest to 800 + 496 + 805? (a) 2000 (b) 2100 (c) 2300 (d) 2200
  8. 8.Round 51.14 to one decimal place. =
  9. 9.Round 38357 to the nearest ten.
  10. 10.Round 76.19 to one decimal place. =
  11. 11.Round 11.11 to one decimal place. =
  12. 12.Round 25.61 to one decimal place. =
  13. 13.Which is closest to 803 ÷ 19? (a) 20 (b) 80 (c) 400 (d) 40
  14. 14.Which is closest to 401 × 29? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  15. 15.Which is closest to 1207 ÷ 41? (a) 15 (b) 30 (c) 300 (d) 60
  16. 16.Which is closest to 905 + 501 + 502? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  17. 17.Round 19.63 to one decimal place. =
  18. 18.Which is closest to 904 ÷ 31? (a) 30 (b) 60 (c) 300 (d) 15
  19. 19.Round 82341 to the nearest ten.
  20. 20.Round 49005 to the nearest hundred.
  21. 21.Which is closest to 1992 ÷ 51? (a) 20 (b) 400 (c) 40 (d) 80
  22. 22.Round 67399 to the nearest thousand.
  23. 23.Which is closest to 993 ÷ 19? (a) 500 (b) 100 (c) 25 (d) 50
  24. 24.Which is closest to 798 × 22? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  25. 25.Which is closest to 695 + 504 + 301? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  26. 26.Round 96315 to the nearest thousand.
  27. 27.Which is closest to 200 + 197 + 795? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  28. 28.Which is closest to 2503 ÷ 51? (a) 50 (b) 25 (c) 500 (d) 100
  29. 29.Which is closest to 1595 ÷ 19? (a) 160 (b) 800 (c) 80 (d) 40
  30. 30.Round 55042 to the nearest ten.
  31. 31.Round 17.14 to one decimal place. =
  32. 32.Which is closest to 498 × 48? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000
  33. 33.Round 19598 to the nearest thousand.
  34. 34.Which is closest to 900 × 71? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
  35. 35.Which is closest to 797 + 697 + 698? (a) 2100 (b) 2200 (c) 2400 (d) 2300
  36. 36.Which is closest to 399 + 895 + 701? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  37. 37.Which is closest to 3202 ÷ 41? (a) 40 (b) 160 (c) 800 (d) 80
  38. 38.Round 31140 to the nearest hundred.
  39. 39.Which is closest to 802 + 296 + 496? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  40. 40.Round 55.58 to one decimal place. =

Answer key

  1. 25190
  2. 30
  3. 52.3
  4. 14.1
  5. 35990
  6. 1800
  7. 2100
  8. 51.1
  9. 38360
  10. 76.2
  11. 11.1
  12. 25.6
  13. 40
  14. 12000
  15. 30
  16. 1900
  17. 19.6
  18. 30
  19. 82340
  20. 49000
  21. 40
  22. 67000
  23. 50
  24. 16000
  25. 1500
  26. 96000
  27. 1200
  28. 50
  29. 80
  30. 55040
  31. 17.1
  32. 25000
  33. 20000
  34. 63000
  35. 2200
  36. 2000
  37. 80
  38. 31100
  39. 1600
  40. 55.6

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