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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 57 · 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 3194 ÷ 41? (a) 160 (b) 40 (c) 80 (d) 800
  2. 2.Round 54.43 to one decimal place. =
  3. 3.Round 64696 to the nearest thousand.
  4. 4.Round 10.83 to one decimal place. =
  5. 5.Which is closest to 397 + 799 + 505? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  6. 6.Round 21.74 to one decimal place. =
  7. 7.Which is closest to 698 × 91? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  8. 8.Round 19.59 to one decimal place. =
  9. 9.Which is closest to 400 × 29? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  10. 10.Round 53586 to the nearest hundred.
  11. 11.Which is closest to 503 × 58? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
  12. 12.Round 29183 to the nearest hundred.
  13. 13.Round 99.86 to one decimal place. =
  14. 14.Which is closest to 204 × 90? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  15. 15.Which is closest to 1193 ÷ 21? (a) 30 (b) 600 (c) 120 (d) 60
  16. 16.Which is closest to 395 + 903 + 98? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  17. 17.Round 32.26 to one decimal place. =
  18. 18.Round 58.88 to one decimal place. =
  19. 19.Which is closest to 1007 ÷ 49? (a) 40 (b) 20 (c) 10 (d) 200
  20. 20.Which is closest to 895 + 895 + 797? (a) 2700 (b) 2800 (c) 2500 (d) 2600
  21. 21.Which is closest to 303 × 28? (Round each number first.) (a) 900 (b) 18000 (c) 9000 (d) 90000
  22. 22.Round 42595 to the nearest hundred.
  23. 23.Which is closest to 401 × 52? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
  24. 24.Which is closest to 600 × 31? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  25. 25.Which is closest to 1608 ÷ 21? (a) 800 (b) 160 (c) 80 (d) 40
  26. 26.Which is closest to 601 + 903 + 598? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  27. 27.Which is closest to 3199 ÷ 39? (a) 80 (b) 40 (c) 800 (d) 160
  28. 28.Which is closest to 404 × 82? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
  29. 29.Round 61494 to the nearest thousand.
  30. 30.Which is closest to 98 + 700 + 503? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  31. 31.Round 24916 to the nearest thousand.
  32. 32.Round 72069 to the nearest hundred.
  33. 33.Which is closest to 1991 ÷ 49? (a) 80 (b) 400 (c) 40 (d) 20
  34. 34.Which is closest to 392 ÷ 19? (a) 40 (b) 20 (c) 200 (d) 10
  35. 35.Which is closest to 701 + 302 + 305? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  36. 36.Round 39656 to the nearest ten.
  37. 37.Which is closest to 2399 ÷ 31? (a) 160 (b) 800 (c) 40 (d) 80
  38. 38.Which is closest to 104 + 503 + 299? (a) 1000 (b) 900 (c) 800 (d) 1100
  39. 39.Which is closest to 498 × 78? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  40. 40.Which is closest to 598 × 72? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000

Answer key

  1. 80
  2. 54.4
  3. 65000
  4. 10.8
  5. 1700
  6. 21.7
  7. 63000
  8. 19.6
  9. 12000
  10. 53600
  11. 30000
  12. 29200
  13. 99.9
  14. 18000
  15. 60
  16. 1400
  17. 32.3
  18. 58.9
  19. 20
  20. 2600
  21. 9000
  22. 42600
  23. 20000
  24. 18000
  25. 80
  26. 2100
  27. 80
  28. 32000
  29. 61000
  30. 1300
  31. 25000
  32. 72100
  33. 40
  34. 20
  35. 1300
  36. 39660
  37. 80
  38. 900
  39. 40000
  40. 42000

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