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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 328 · 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 500 × 91? (Round each number first.) (a) 45000 (b) 4500 (c) 450000 (d) 90000
  2. 2.Round 71.14 to one decimal place. =
  3. 3.Which is closest to 1194 ÷ 39? (a) 300 (b) 15 (c) 30 (d) 60
  4. 4.Which is closest to 2095 ÷ 29? (a) 700 (b) 70 (c) 35 (d) 140
  5. 5.Round 74733 to the nearest ten.
  6. 6.Which is closest to 699 × 68? (Round each number first.) (a) 49000 (b) 4900 (c) 490000 (d) 98000
  7. 7.Which is closest to 1792 ÷ 31? (a) 30 (b) 120 (c) 60 (d) 600
  8. 8.Which is closest to 504 × 31? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  9. 9.Which is closest to 805 + 895 + 696? (a) 2500 (b) 2600 (c) 2400 (d) 2300
  10. 10.Round 81.16 to one decimal place. =
  11. 11.Round 64.77 to one decimal place. =
  12. 12.Which is closest to 203 × 90? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  13. 13.Round 64410 to the nearest hundred.
  14. 14.Which is closest to 799 × 91? (Round each number first.) (a) 7200 (b) 720000 (c) 144000 (d) 72000
  15. 15.Round 89817 to the nearest ten.
  16. 16.Round 47009 to the nearest hundred.
  17. 17.Which is closest to 797 × 69? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  18. 18.Which is closest to 3506 ÷ 51? (a) 70 (b) 35 (c) 700 (d) 140
  19. 19.Round 42.32 to one decimal place. =
  20. 20.Round 94.29 to one decimal place. =
  21. 21.Which is closest to 401 × 30? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  22. 22.Round 79814 to the nearest ten.
  23. 23.Which is closest to 203 × 32? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000
  24. 24.Which is closest to 503 × 22? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  25. 25.Which is closest to 700 + 199 + 497? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  26. 26.Round 25.33 to one decimal place. =
  27. 27.Round 27602 to the nearest ten.
  28. 28.Which is closest to 298 × 30? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  29. 29.Round 76.38 to one decimal place. =
  30. 30.Round 66836 to the nearest thousand.
  31. 31.Which is closest to 804 ÷ 19? (a) 20 (b) 80 (c) 40 (d) 400
  32. 32.Round 45495 to the nearest hundred.
  33. 33.Round 25452 to the nearest hundred.
  34. 34.Which is closest to 199 × 21? (Round each number first.) (a) 8000 (b) 4000 (c) 40000 (d) 400
  35. 35.Round 82.12 to one decimal place. =
  36. 36.Round 63.13 to one decimal place. =
  37. 37.Which is closest to 601 ÷ 31? (a) 10 (b) 40 (c) 20 (d) 200
  38. 38.Which is closest to 1503 ÷ 51? (a) 60 (b) 300 (c) 15 (d) 30
  39. 39.Which is closest to 603 × 72? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
  40. 40.Round 31.77 to one decimal place. =

Answer key

  1. 45000
  2. 71.1
  3. 30
  4. 70
  5. 74730
  6. 49000
  7. 60
  8. 15000
  9. 2400
  10. 81.2
  11. 64.8
  12. 18000
  13. 64400
  14. 72000
  15. 89820
  16. 47000
  17. 56000
  18. 70
  19. 42.3
  20. 94.3
  21. 12000
  22. 79810
  23. 6000
  24. 10000
  25. 1400
  26. 25.3
  27. 27600
  28. 9000
  29. 76.4
  30. 67000
  31. 40
  32. 45500
  33. 25500
  34. 4000
  35. 82.1
  36. 63.1
  37. 20
  38. 30
  39. 42000
  40. 31.8

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