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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 959 · 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 1191 ÷ 19? (a) 120 (b) 600 (c) 60 (d) 30
  2. 2.Round 34.74 to one decimal place. =
  3. 3.Round 58.67 to one decimal place. =
  4. 4.Which is closest to 601 × 41? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  5. 5.Which is closest to 404 × 69? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  6. 6.Round 79.71 to one decimal place. =
  7. 7.Which is closest to 97 + 903 + 701? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  8. 8.Which is closest to 197 + 796 + 99? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  9. 9.Round 22.88 to one decimal place. =
  10. 10.Round 57.21 to one decimal place. =
  11. 11.Which is closest to 2494 ÷ 49? (a) 50 (b) 500 (c) 100 (d) 25
  12. 12.Which is closest to 1796 ÷ 21? (a) 90 (b) 45 (c) 180 (d) 900
  13. 13.Which is closest to 397 × 81? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  14. 14.Which is closest to 902 × 50? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  15. 15.Round 93538 to the nearest ten.
  16. 16.Round 67498 to the nearest ten.
  17. 17.Which is closest to 704 × 88? (Round each number first.) (a) 630000 (b) 63000 (c) 126000 (d) 6300
  18. 18.Round 85.43 to one decimal place. =
  19. 19.Which is closest to 806 ÷ 21? (a) 40 (b) 80 (c) 400 (d) 20
  20. 20.Round 25512 to the nearest thousand.
  21. 21.Which is closest to 197 × 31? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  22. 22.Which is closest to 598 × 68? (Round each number first.) (a) 42000 (b) 4200 (c) 84000 (d) 420000
  23. 23.Round 80.49 to one decimal place. =
  24. 24.Round 38362 to the nearest ten.
  25. 25.Which is closest to 304 + 96 + 98? (a) 600 (b) 700 (c) 500 (d) 400
  26. 26.Which is closest to 702 + 295 + 205? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  27. 27.Round 88.82 to one decimal place. =
  28. 28.Which is closest to 303 × 40? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  29. 29.Which is closest to 198 × 58? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  30. 30.Round 94.47 to one decimal place. =
  31. 31.Which is closest to 793 ÷ 19? (a) 20 (b) 80 (c) 40 (d) 400
  32. 32.Round 63568 to the nearest thousand.
  33. 33.Round 86.93 to one decimal place. =
  34. 34.Round 21937 to the nearest thousand.
  35. 35.Round 78232 to the nearest thousand.
  36. 36.Round 52941 to the nearest hundred.
  37. 37.Round 17112 to the nearest ten.
  38. 38.Round 34.42 to one decimal place. =
  39. 39.Which is closest to 503 + 502 + 802? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  40. 40.Which is closest to 2706 ÷ 31? (a) 900 (b) 45 (c) 90 (d) 180

Answer key

  1. 60
  2. 34.7
  3. 58.7
  4. 24000
  5. 28000
  6. 79.7
  7. 1700
  8. 1100
  9. 22.9
  10. 57.2
  11. 50
  12. 90
  13. 32000
  14. 45000
  15. 93540
  16. 67500
  17. 63000
  18. 85.4
  19. 40
  20. 26000
  21. 6000
  22. 42000
  23. 80.5
  24. 38360
  25. 500
  26. 1200
  27. 88.8
  28. 12000
  29. 12000
  30. 94.5
  31. 40
  32. 64000
  33. 86.9
  34. 22000
  35. 78000
  36. 52900
  37. 17110
  38. 34.4
  39. 1800
  40. 90

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