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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 343 · 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 799 × 78? (Round each number first.) (a) 6400 (b) 640000 (c) 128000 (d) 64000
  2. 2.Which is closest to 298 × 70? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  3. 3.Which is closest to 900 × 89? (Round each number first.) (a) 81000 (b) 810000 (c) 8100 (d) 162000
  4. 4.Round 67.59 to one decimal place. =
  5. 5.Which is closest to 3507 ÷ 49? (a) 700 (b) 140 (c) 35 (d) 70
  6. 6.Round 27447 to the nearest hundred.
  7. 7.Which is closest to 799 × 38? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  8. 8.Round 78.32 to one decimal place. =
  9. 9.Which is closest to 2509 ÷ 51? (a) 100 (b) 500 (c) 25 (d) 50
  10. 10.Which is closest to 697 × 60? (Round each number first.) (a) 42000 (b) 84000 (c) 420000 (d) 4200
  11. 11.Round 27.53 to one decimal place. =
  12. 12.Which is closest to 297 × 81? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  13. 13.Which is closest to 700 × 48? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  14. 14.Which is closest to 800 × 31? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  15. 15.Which is closest to 799 × 29? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  16. 16.Which is closest to 699 × 39? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  17. 17.Which is closest to 2393 ÷ 41? (a) 30 (b) 600 (c) 60 (d) 120
  18. 18.Which is closest to 400 + 97 + 704? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  19. 19.Which is closest to 3607 ÷ 41? (a) 900 (b) 45 (c) 180 (d) 90
  20. 20.Round 81.92 to one decimal place. =
  21. 21.Which is closest to 991 ÷ 21? (a) 25 (b) 500 (c) 100 (d) 50
  22. 22.Which is closest to 501 + 102 + 196? (a) 900 (b) 1000 (c) 800 (d) 700
  23. 23.Which is closest to 796 + 400 + 397? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  24. 24.Round 18108 to the nearest hundred.
  25. 25.Round 13.38 to one decimal place. =
  26. 26.Round 48813 to the nearest thousand.
  27. 27.Round 75.42 to one decimal place. =
  28. 28.Round 52268 to the nearest thousand.
  29. 29.Which is closest to 406 ÷ 19? (a) 200 (b) 40 (c) 10 (d) 20
  30. 30.Round 47.69 to one decimal place. =
  31. 31.Which is closest to 2091 ÷ 31? (a) 140 (b) 70 (c) 700 (d) 35
  32. 32.Which is closest to 1502 ÷ 51? (a) 30 (b) 300 (c) 15 (d) 60
  33. 33.Which is closest to 202 + 498 + 300? (a) 1000 (b) 900 (c) 1100 (d) 1200
  34. 34.Which is closest to 2793 ÷ 41? (a) 140 (b) 35 (c) 700 (d) 70
  35. 35.Round 19917 to the nearest thousand.
  36. 36.Round 41813 to the nearest thousand.
  37. 37.Which is closest to 298 × 52? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  38. 38.Which is closest to 1791 ÷ 31? (a) 30 (b) 600 (c) 60 (d) 120
  39. 39.Which is closest to 2698 ÷ 31? (a) 900 (b) 90 (c) 180 (d) 45
  40. 40.Which is closest to 96 + 204 + 796? (a) 1000 (b) 1300 (c) 1200 (d) 1100

Answer key

  1. 64000
  2. 21000
  3. 81000
  4. 67.6
  5. 70
  6. 27400
  7. 32000
  8. 78.3
  9. 50
  10. 42000
  11. 27.5
  12. 24000
  13. 35000
  14. 24000
  15. 24000
  16. 28000
  17. 60
  18. 1200
  19. 90
  20. 81.9
  21. 50
  22. 800
  23. 1600
  24. 18100
  25. 13.4
  26. 49000
  27. 75.4
  28. 52000
  29. 20
  30. 47.7
  31. 70
  32. 30
  33. 1000
  34. 70
  35. 20000
  36. 42000
  37. 15000
  38. 60
  39. 90
  40. 1100

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