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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 15 · 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 60.28 to one decimal place. =
  2. 2.Round 64.66 to one decimal place. =
  3. 3.Round 49611 to the nearest ten.
  4. 4.Round 5274 to the nearest ten.
  5. 5.Round 85.14 to one decimal place. =
  6. 6.Round 69521 to the nearest ten.
  7. 7.Which is closest to 700 × 58? (Round each number first.) (a) 84000 (b) 420000 (c) 42000 (d) 4200
  8. 8.Which is closest to 1599 ÷ 41? (a) 20 (b) 40 (c) 80 (d) 400
  9. 9.Which is closest to 600 × 41? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  10. 10.Which is closest to 600 × 61? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  11. 11.Which is closest to 303 + 496 + 798? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  12. 12.Which is closest to 1497 ÷ 49? (a) 30 (b) 60 (c) 15 (d) 300
  13. 13.Which is closest to 302 × 78? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  14. 14.Which is closest to 499 × 18? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  15. 15.Which is closest to 1606 ÷ 19? (a) 40 (b) 80 (c) 800 (d) 160
  16. 16.Which is closest to 904 × 60? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  17. 17.Which is closest to 302 × 18? (Round each number first.) (a) 60000 (b) 6000 (c) 600 (d) 12000
  18. 18.Which is closest to 197 × 78? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  19. 19.Which is closest to 299 + 500 + 798? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  20. 20.Which is closest to 599 + 797 + 305? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  21. 21.Which is closest to 4503 ÷ 49? (a) 180 (b) 900 (c) 90 (d) 45
  22. 22.Round 89074 to the nearest hundred.
  23. 23.Which is closest to 399 × 41? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  24. 24.Round 53.16 to one decimal place. =
  25. 25.Which is closest to 3594 ÷ 39? (a) 45 (b) 180 (c) 90 (d) 900
  26. 26.Which is closest to 496 + 804 + 496? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  27. 27.Which is closest to 803 × 30? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  28. 28.Which is closest to 800 ÷ 41? (a) 200 (b) 10 (c) 20 (d) 40
  29. 29.Round 61627 to the nearest hundred.
  30. 30.Which is closest to 798 + 204 + 96? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  31. 31.Which is closest to 201 × 20? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  32. 32.Round 26.26 to one decimal place. =
  33. 33.Which is closest to 496 × 51? (Round each number first.) (a) 2500 (b) 25000 (c) 250000 (d) 50000
  34. 34.Round 1271 to the nearest hundred.
  35. 35.Round 70.63 to one decimal place. =
  36. 36.Round 51806 to the nearest ten.
  37. 37.Which is closest to 296 + 103 + 201? (a) 500 (b) 700 (c) 600 (d) 800
  38. 38.Round 90717 to the nearest hundred.
  39. 39.Which is closest to 800 × 72? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
  40. 40.Which is closest to 597 + 496 + 605? (a) 1600 (b) 1700 (c) 1800 (d) 1900

Answer key

  1. 60.3
  2. 64.7
  3. 49610
  4. 5270
  5. 85.1
  6. 69520
  7. 42000
  8. 40
  9. 24000
  10. 36000
  11. 1600
  12. 30
  13. 24000
  14. 10000
  15. 80
  16. 54000
  17. 6000
  18. 16000
  19. 1600
  20. 1700
  21. 90
  22. 89100
  23. 16000
  24. 53.2
  25. 90
  26. 1800
  27. 24000
  28. 20
  29. 61600
  30. 1100
  31. 4000
  32. 26.3
  33. 25000
  34. 1300
  35. 70.6
  36. 51810
  37. 600
  38. 90700
  39. 56000
  40. 1700

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