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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 607 · 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 2107 ÷ 29? (a) 700 (b) 140 (c) 70 (d) 35
  2. 2.Which is closest to 896 × 91? (Round each number first.) (a) 162000 (b) 810000 (c) 81000 (d) 8100
  3. 3.Which is closest to 899 × 81? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  4. 4.Which is closest to 604 ÷ 21? (a) 60 (b) 15 (c) 300 (d) 30
  5. 5.Which is closest to 1997 ÷ 39? (a) 25 (b) 500 (c) 100 (d) 50
  6. 6.Which is closest to 99 + 97 + 898? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  7. 7.Round 28.92 to one decimal place. =
  8. 8.Which is closest to 96 + 396 + 701? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  9. 9.Round 69519 to the nearest hundred.
  10. 10.Round 22.72 to one decimal place. =
  11. 11.Which is closest to 595 + 795 + 301? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  12. 12.Which is closest to 701 × 39? (Round each number first.) (a) 56000 (b) 280000 (c) 2800 (d) 28000
  13. 13.Which is closest to 1502 ÷ 31? (a) 500 (b) 50 (c) 100 (d) 25
  14. 14.Which is closest to 2399 ÷ 41? (a) 600 (b) 120 (c) 60 (d) 30
  15. 15.Which is closest to 501 × 30? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  16. 16.Which is closest to 301 × 20? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  17. 17.Which is closest to 2803 ÷ 39? (a) 140 (b) 70 (c) 700 (d) 35
  18. 18.Which is closest to 701 + 896 + 500? (a) 2000 (b) 2200 (c) 2100 (d) 2300
  19. 19.Which is closest to 2494 ÷ 51? (a) 100 (b) 25 (c) 500 (d) 50
  20. 20.Round 48241 to the nearest ten.
  21. 21.Round 27300 to the nearest thousand.
  22. 22.Which is closest to 299 × 90? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  23. 23.Round 50337 to the nearest thousand.
  24. 24.Round 92.66 to one decimal place. =
  25. 25.Which is closest to 697 × 19? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  26. 26.Round 20.33 to one decimal place. =
  27. 27.Round 53.14 to one decimal place. =
  28. 28.Round 83566 to the nearest hundred.
  29. 29.Round 96294 to the nearest ten.
  30. 30.Round 53475 to the nearest thousand.
  31. 31.Which is closest to 1995 ÷ 39? (a) 100 (b) 25 (c) 500 (d) 50
  32. 32.Which is closest to 4493 ÷ 49? (a) 45 (b) 90 (c) 900 (d) 180
  33. 33.Which is closest to 596 × 58? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
  34. 34.Which is closest to 596 × 50? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
  35. 35.Round 76.27 to one decimal place. =
  36. 36.Which is closest to 594 ÷ 31? (a) 20 (b) 40 (c) 10 (d) 200
  37. 37.Round 50.77 to one decimal place. =
  38. 38.Which is closest to 202 × 50? (Round each number first.) (a) 10000 (b) 1000 (c) 20000 (d) 100000
  39. 39.Which is closest to 796 × 20? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  40. 40.Round 98.64 to one decimal place. =

Answer key

  1. 70
  2. 81000
  3. 72000
  4. 30
  5. 50
  6. 1100
  7. 28.9
  8. 1200
  9. 69500
  10. 22.7
  11. 1700
  12. 28000
  13. 50
  14. 60
  15. 15000
  16. 6000
  17. 70
  18. 2100
  19. 50
  20. 48240
  21. 27000
  22. 27000
  23. 50000
  24. 92.7
  25. 14000
  26. 20.3
  27. 53.1
  28. 83600
  29. 96290
  30. 53000
  31. 50
  32. 90
  33. 36000
  34. 30000
  35. 76.3
  36. 20
  37. 50.8
  38. 10000
  39. 16000
  40. 98.6

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