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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 748 · 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 39.31 to one decimal place. =
  2. 2.Which is closest to 393 ÷ 19? (a) 10 (b) 200 (c) 20 (d) 40
  3. 3.Which is closest to 2496 ÷ 49? (a) 500 (b) 100 (c) 50 (d) 25
  4. 4.Round 67291 to the nearest ten.
  5. 5.Which is closest to 798 × 19? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  6. 6.Which is closest to 401 × 59? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  7. 7.Which is closest to 896 × 39? (Round each number first.) (a) 360000 (b) 36000 (c) 3600 (d) 72000
  8. 8.Round 17412 to the nearest ten.
  9. 9.Which is closest to 198 + 700 + 95? (a) 1000 (b) 900 (c) 1200 (d) 1100
  10. 10.Round 66.66 to one decimal place. =
  11. 11.Round 42354 to the nearest ten.
  12. 12.Round 51145 to the nearest thousand.
  13. 13.Which is closest to 897 × 81? (Round each number first.) (a) 144000 (b) 720000 (c) 72000 (d) 7200
  14. 14.Round 96531 to the nearest ten.
  15. 15.Which is closest to 700 × 69? (Round each number first.) (a) 49000 (b) 490000 (c) 4900 (d) 98000
  16. 16.Which is closest to 1598 ÷ 39? (a) 40 (b) 80 (c) 20 (d) 400
  17. 17.Which is closest to 704 + 597 + 702? (a) 1900 (b) 2100 (c) 2000 (d) 2200
  18. 18.Which is closest to 1196 ÷ 39? (a) 30 (b) 15 (c) 60 (d) 300
  19. 19.Which is closest to 798 + 404 + 197? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  20. 20.Round 94.12 to one decimal place. =
  21. 21.Round 69.69 to one decimal place. =
  22. 22.Round 80919 to the nearest ten.
  23. 23.Which is closest to 1991 ÷ 49? (a) 400 (b) 80 (c) 20 (d) 40
  24. 24.Which is closest to 1497 ÷ 29? (a) 500 (b) 25 (c) 50 (d) 100
  25. 25.Which is closest to 1000 ÷ 49? (a) 40 (b) 20 (c) 200 (d) 10
  26. 26.Which is closest to 599 × 50? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
  27. 27.Round 10.91 to one decimal place. =
  28. 28.Which is closest to 797 × 88? (Round each number first.) (a) 720000 (b) 7200 (c) 72000 (d) 144000
  29. 29.Round 14.24 to one decimal place. =
  30. 30.Which is closest to 1997 ÷ 39? (a) 500 (b) 25 (c) 50 (d) 100
  31. 31.Round 88123 to the nearest thousand.
  32. 32.Which is closest to 401 × 19? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  33. 33.Which is closest to 303 × 80? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  34. 34.Which is closest to 1603 ÷ 19? (a) 40 (b) 160 (c) 80 (d) 800
  35. 35.Which is closest to 705 + 498 + 296? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  36. 36.Which is closest to 304 + 103 + 601? (a) 900 (b) 1200 (c) 1100 (d) 1000
  37. 37.Which is closest to 2494 ÷ 51? (a) 500 (b) 100 (c) 25 (d) 50
  38. 38.Which is closest to 1207 ÷ 31? (a) 20 (b) 80 (c) 400 (d) 40
  39. 39.Which is closest to 804 × 51? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  40. 40.Which is closest to 400 + 697 + 902? (a) 2000 (b) 1900 (c) 2100 (d) 2200

Answer key

  1. 39.3
  2. 20
  3. 50
  4. 67290
  5. 16000
  6. 24000
  7. 36000
  8. 17410
  9. 1000
  10. 66.7
  11. 42350
  12. 51000
  13. 72000
  14. 96530
  15. 49000
  16. 40
  17. 2000
  18. 30
  19. 1400
  20. 94.1
  21. 69.7
  22. 80920
  23. 40
  24. 50
  25. 20
  26. 30000
  27. 10.9
  28. 72000
  29. 14.2
  30. 50
  31. 88000
  32. 8000
  33. 24000
  34. 80
  35. 1500
  36. 1000
  37. 50
  38. 40
  39. 40000
  40. 2000

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