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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 843 · 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 701 + 601 + 295? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  2. 2.Which is closest to 298 × 72? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000
  3. 3.Round 96.36 to one decimal place. =
  4. 4.Which is closest to 404 + 200 + 797? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  5. 5.Round 50.54 to one decimal place. =
  6. 6.Which is closest to 201 × 91? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  7. 7.Which is closest to 603 + 797 + 395? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  8. 8.Which is closest to 792 ÷ 21? (a) 80 (b) 400 (c) 20 (d) 40
  9. 9.Round 1033 to the nearest thousand.
  10. 10.Which is closest to 597 × 79? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  11. 11.Round 12.16 to one decimal place. =
  12. 12.Round 97.69 to one decimal place. =
  13. 13.Which is closest to 597 × 60? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  14. 14.Which is closest to 96 + 895 + 96? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  15. 15.Round 46638 to the nearest thousand.
  16. 16.Which is closest to 903 + 298 + 701? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  17. 17.Which is closest to 704 + 497 + 96? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  18. 18.Which is closest to 504 × 18? (Round each number first.) (a) 10000 (b) 20000 (c) 100000 (d) 1000
  19. 19.Which is closest to 697 × 49? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  20. 20.Which is closest to 696 × 41? (Round each number first.) (a) 28000 (b) 280000 (c) 56000 (d) 2800
  21. 21.Which is closest to 497 × 82? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  22. 22.Round 44.44 to one decimal place. =
  23. 23.Which is closest to 2505 ÷ 49? (a) 100 (b) 500 (c) 25 (d) 50
  24. 24.Round 22697 to the nearest thousand.
  25. 25.Which is closest to 597 × 31? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  26. 26.Which is closest to 805 + 704 + 497? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  27. 27.Which is closest to 1491 ÷ 51? (a) 60 (b) 15 (c) 30 (d) 300
  28. 28.Which is closest to 902 × 81? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  29. 29.Which is closest to 1799 ÷ 19? (a) 900 (b) 45 (c) 90 (d) 180
  30. 30.Round 5742 to the nearest hundred.
  31. 31.Which is closest to 3202 ÷ 39? (a) 80 (b) 800 (c) 160 (d) 40
  32. 32.Which is closest to 801 × 42? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  33. 33.Which is closest to 1606 ÷ 19? (a) 80 (b) 800 (c) 160 (d) 40
  34. 34.Which is closest to 1193 ÷ 21? (a) 60 (b) 30 (c) 120 (d) 600
  35. 35.Round 41389 to the nearest ten.
  36. 36.Which is closest to 1594 ÷ 21? (a) 160 (b) 80 (c) 800 (d) 40
  37. 37.Which is closest to 1606 ÷ 39? (a) 20 (b) 40 (c) 80 (d) 400
  38. 38.Round 52.56 to one decimal place. =
  39. 39.Which is closest to 591 ÷ 29? (a) 40 (b) 10 (c) 200 (d) 20
  40. 40.Which is closest to 902 × 51? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000

Answer key

  1. 1600
  2. 21000
  3. 96.4
  4. 1400
  5. 50.5
  6. 18000
  7. 1800
  8. 40
  9. 1000
  10. 48000
  11. 12.2
  12. 97.7
  13. 36000
  14. 1100
  15. 47000
  16. 1900
  17. 1300
  18. 10000
  19. 35000
  20. 28000
  21. 40000
  22. 44.4
  23. 50
  24. 23000
  25. 18000
  26. 2000
  27. 30
  28. 72000
  29. 90
  30. 5700
  31. 80
  32. 32000
  33. 80
  34. 60
  35. 41390
  36. 80
  37. 40
  38. 52.6
  39. 20
  40. 45000

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