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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 197 · 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 999 ÷ 49? (a) 20 (b) 40 (c) 200 (d) 10
  2. 2.Which is closest to 3001 ÷ 51? (a) 600 (b) 30 (c) 60 (d) 120
  3. 3.Which is closest to 299 × 70? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  4. 4.Which is closest to 403 + 403 + 302? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  5. 5.Round 76214 to the nearest ten.
  6. 6.Which is closest to 398 × 18? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  7. 7.Which is closest to 4000 ÷ 49? (a) 40 (b) 160 (c) 80 (d) 800
  8. 8.Round 97511 to the nearest hundred.
  9. 9.Round 17370 to the nearest thousand.
  10. 10.Round 65420 to the nearest hundred.
  11. 11.Round 53.29 to one decimal place. =
  12. 12.Which is closest to 301 + 702 + 397? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  13. 13.Which is closest to 404 + 801 + 598? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  14. 14.Which is closest to 105 + 202 + 105? (a) 600 (b) 300 (c) 500 (d) 400
  15. 15.Which is closest to 399 ÷ 21? (a) 200 (b) 20 (c) 40 (d) 10
  16. 16.Round 39676 to the nearest thousand.
  17. 17.Which is closest to 696 × 60? (Round each number first.) (a) 84000 (b) 4200 (c) 420000 (d) 42000
  18. 18.Which is closest to 95 + 199 + 97? (a) 600 (b) 400 (c) 300 (d) 500
  19. 19.Which is closest to 101 + 100 + 96? (a) 400 (b) 200 (c) 500 (d) 300
  20. 20.Round 71976 to the nearest ten.
  21. 21.Round 32772 to the nearest hundred.
  22. 22.Round 50.51 to one decimal place. =
  23. 23.Which is closest to 796 × 51? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  24. 24.Which is closest to 704 × 70? (Round each number first.) (a) 49000 (b) 4900 (c) 490000 (d) 98000
  25. 25.Which is closest to 902 + 197 + 502? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  26. 26.Round 79312 to the nearest hundred.
  27. 27.Which is closest to 103 + 604 + 195? (a) 900 (b) 1000 (c) 1100 (d) 800
  28. 28.Which is closest to 991 ÷ 51? (a) 200 (b) 20 (c) 40 (d) 10
  29. 29.Which is closest to 497 × 79? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  30. 30.Which is closest to 792 ÷ 21? (a) 80 (b) 40 (c) 20 (d) 400
  31. 31.Which is closest to 598 × 19? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  32. 32.Which is closest to 205 + 701 + 702? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  33. 33.Round 19949 to the nearest thousand.
  34. 34.Which is closest to 499 × 41? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  35. 35.Which is closest to 297 × 30? (Round each number first.) (a) 90000 (b) 900 (c) 9000 (d) 18000
  36. 36.Which is closest to 104 + 899 + 398? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  37. 37.Round 34.83 to one decimal place. =
  38. 38.Round 82.92 to one decimal place. =
  39. 39.Which is closest to 896 × 20? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  40. 40.Which is closest to 797 × 21? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000

Answer key

  1. 20
  2. 60
  3. 21000
  4. 1100
  5. 76210
  6. 8000
  7. 80
  8. 97500
  9. 17000
  10. 65400
  11. 53.3
  12. 1400
  13. 1800
  14. 400
  15. 20
  16. 40000
  17. 42000
  18. 400
  19. 300
  20. 71980
  21. 32800
  22. 50.5
  23. 40000
  24. 49000
  25. 1600
  26. 79300
  27. 900
  28. 20
  29. 40000
  30. 40
  31. 12000
  32. 1600
  33. 20000
  34. 20000
  35. 9000
  36. 1400
  37. 34.8
  38. 82.9
  39. 18000
  40. 16000

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