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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 683 · 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 40.79 to one decimal place. =
  2. 2.Round 12.37 to one decimal place. =
  3. 3.Round 15.74 to one decimal place. =
  4. 4.Round 77.27 to one decimal place. =
  5. 5.Which is closest to 596 ÷ 19? (a) 15 (b) 30 (c) 300 (d) 60
  6. 6.Which is closest to 601 × 30? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  7. 7.Round 12.07 to one decimal place. =
  8. 8.Round 48.14 to one decimal place. =
  9. 9.Which is closest to 199 × 19? (Round each number first.) (a) 400 (b) 8000 (c) 40000 (d) 4000
  10. 10.Which is closest to 702 × 69? (Round each number first.) (a) 4900 (b) 490000 (c) 98000 (d) 49000
  11. 11.Which is closest to 302 × 18? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  12. 12.Round 72.27 to one decimal place. =
  13. 13.Which is closest to 903 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30
  14. 14.Which is closest to 298 + 204 + 298? (a) 1000 (b) 900 (c) 800 (d) 700
  15. 15.Which is closest to 198 × 88? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  16. 16.Which is closest to 403 + 601 + 101? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  17. 17.Which is closest to 600 + 499 + 100? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  18. 18.Round 39103 to the nearest hundred.
  19. 19.Round 23040 to the nearest hundred.
  20. 20.Which is closest to 798 ÷ 41? (a) 40 (b) 200 (c) 10 (d) 20
  21. 21.Which is closest to 201 × 68? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  22. 22.Round 21.81 to one decimal place. =
  23. 23.Which is closest to 498 × 28? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  24. 24.Which is closest to 503 × 42? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
  25. 25.Round 77046 to the nearest thousand.
  26. 26.Which is closest to 4002 ÷ 51? (a) 160 (b) 40 (c) 800 (d) 80
  27. 27.Which is closest to 296 × 39? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  28. 28.Which is closest to 404 × 52? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  29. 29.Round 4532 to the nearest hundred.
  30. 30.Which is closest to 1506 ÷ 49? (a) 30 (b) 300 (c) 15 (d) 60
  31. 31.Which is closest to 609 ÷ 29? (a) 20 (b) 10 (c) 200 (d) 40
  32. 32.Round 69.21 to one decimal place. =
  33. 33.Which is closest to 704 + 100 + 98? (a) 1000 (b) 900 (c) 800 (d) 1100
  34. 34.Which is closest to 2404 ÷ 31? (a) 160 (b) 40 (c) 80 (d) 800
  35. 35.Which is closest to 400 × 62? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  36. 36.Round 74.16 to one decimal place. =
  37. 37.Round 82.76 to one decimal place. =
  38. 38.Round 59602 to the nearest hundred.
  39. 39.Round 89593 to the nearest ten.
  40. 40.Round 95.93 to one decimal place. =

Answer key

  1. 40.8
  2. 12.4
  3. 15.7
  4. 77.3
  5. 30
  6. 18000
  7. 12.1
  8. 48.1
  9. 4000
  10. 49000
  11. 6000
  12. 72.3
  13. 30
  14. 800
  15. 18000
  16. 1100
  17. 1200
  18. 39100
  19. 23000
  20. 20
  21. 14000
  22. 21.8
  23. 15000
  24. 20000
  25. 77000
  26. 80
  27. 12000
  28. 20000
  29. 4500
  30. 30
  31. 20
  32. 69.2
  33. 900
  34. 80
  35. 24000
  36. 74.2
  37. 82.8
  38. 59600
  39. 89590
  40. 95.9

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