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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 974 · 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 598 × 70? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  2. 2.Round 63853 to the nearest ten.
  3. 3.Which is closest to 505 + 102 + 401? (a) 1100 (b) 1200 (c) 1000 (d) 900
  4. 4.Round 59.72 to one decimal place. =
  5. 5.Which is closest to 497 × 58? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
  6. 6.Which is closest to 301 × 61? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  7. 7.Which is closest to 1204 ÷ 19? (a) 600 (b) 60 (c) 30 (d) 120
  8. 8.Which is closest to 698 × 89? (Round each number first.) (a) 63000 (b) 630000 (c) 126000 (d) 6300
  9. 9.Which is closest to 202 × 88? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  10. 10.Round 60.71 to one decimal place. =
  11. 11.Which is closest to 295 + 98 + 504? (a) 1100 (b) 900 (c) 800 (d) 1000
  12. 12.Which is closest to 503 × 20? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  13. 13.Which is closest to 4500 ÷ 49? (a) 90 (b) 180 (c) 900 (d) 45
  14. 14.Which is closest to 1792 ÷ 21? (a) 180 (b) 90 (c) 900 (d) 45
  15. 15.Round 41.82 to one decimal place. =
  16. 16.Round 59.19 to one decimal place. =
  17. 17.Round 30722 to the nearest ten.
  18. 18.Which is closest to 596 × 18? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  19. 19.Which is closest to 799 × 32? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  20. 20.Which is closest to 391 ÷ 19? (a) 200 (b) 40 (c) 20 (d) 10
  21. 21.Which is closest to 401 ÷ 21? (a) 200 (b) 20 (c) 40 (d) 10
  22. 22.Round 9427 to the nearest thousand.
  23. 23.Which is closest to 1206 ÷ 41? (a) 30 (b) 15 (c) 60 (d) 300
  24. 24.Round 33090 to the nearest hundred.
  25. 25.Round 43579 to the nearest hundred.
  26. 26.Round 1154 to the nearest hundred.
  27. 27.Round 15.51 to one decimal place. =
  28. 28.Which is closest to 805 + 499 + 495? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  29. 29.Which is closest to 398 × 31? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  30. 30.Round 89.66 to one decimal place. =
  31. 31.Which is closest to 301 + 504 + 304? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  32. 32.Round 36.34 to one decimal place. =
  33. 33.Which is closest to 297 × 21? (Round each number first.) (a) 6000 (b) 12000 (c) 600 (d) 60000
  34. 34.Which is closest to 900 + 104 + 198? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  35. 35.Which is closest to 96 + 596 + 297? (a) 1200 (b) 900 (c) 1000 (d) 1100
  36. 36.Which is closest to 3006 ÷ 51? (a) 120 (b) 30 (c) 60 (d) 600
  37. 37.Which is closest to 797 × 80? (Round each number first.) (a) 640000 (b) 64000 (c) 6400 (d) 128000
  38. 38.Which is closest to 2098 ÷ 31? (a) 35 (b) 70 (c) 700 (d) 140
  39. 39.Round 9523 to the nearest hundred.
  40. 40.Which is closest to 397 × 59? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000

Answer key

  1. 42000
  2. 63850
  3. 1000
  4. 59.7
  5. 30000
  6. 18000
  7. 60
  8. 63000
  9. 18000
  10. 60.7
  11. 900
  12. 10000
  13. 90
  14. 90
  15. 41.8
  16. 59.2
  17. 30720
  18. 12000
  19. 24000
  20. 20
  21. 20
  22. 9000
  23. 30
  24. 33100
  25. 43600
  26. 1200
  27. 15.5
  28. 1800
  29. 12000
  30. 89.7
  31. 1100
  32. 36.3
  33. 6000
  34. 1200
  35. 1000
  36. 60
  37. 64000
  38. 70
  39. 9500
  40. 24000

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