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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 265 · 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.Round 74.14 to one decimal place. =
  2. 2.Round 47589 to the nearest thousand.
  3. 3.Which is closest to 905 + 401 + 398? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  4. 4.Round 27724 to the nearest ten.
  5. 5.Which is closest to 402 × 30? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  6. 6.Which is closest to 498 × 39? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  7. 7.Which is closest to 596 + 403 + 905? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  8. 8.Round 53274 to the nearest ten.
  9. 9.Which is closest to 798 × 39? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  10. 10.Round 30251 to the nearest hundred.
  11. 11.Round 8649 to the nearest ten.
  12. 12.Which is closest to 2499 ÷ 49? (a) 25 (b) 500 (c) 100 (d) 50
  13. 13.Which is closest to 797 × 70? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
  14. 14.Which is closest to 698 × 18? (Round each number first.) (a) 14000 (b) 28000 (c) 140000 (d) 1400
  15. 15.Which is closest to 4492 ÷ 49? (a) 90 (b) 900 (c) 45 (d) 180
  16. 16.Which is closest to 1195 ÷ 21? (a) 600 (b) 120 (c) 30 (d) 60
  17. 17.Which is closest to 2706 ÷ 29? (a) 45 (b) 90 (c) 180 (d) 900
  18. 18.Round 82929 to the nearest thousand.
  19. 19.Which is closest to 600 + 498 + 299? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  20. 20.Round 78352 to the nearest ten.
  21. 21.Which is closest to 103 + 99 + 801? (a) 900 (b) 1200 (c) 1100 (d) 1000
  22. 22.Which is closest to 2391 ÷ 41? (a) 30 (b) 600 (c) 120 (d) 60
  23. 23.Which is closest to 401 × 31? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  24. 24.Round 25278 to the nearest ten.
  25. 25.Which is closest to 101 + 102 + 301? (a) 700 (b) 400 (c) 600 (d) 500
  26. 26.Which is closest to 798 + 904 + 602? (a) 2200 (b) 2400 (c) 2500 (d) 2300
  27. 27.Round 62037 to the nearest hundred.
  28. 28.Round 17202 to the nearest ten.
  29. 29.Round 35.29 to one decimal place. =
  30. 30.Which is closest to 202 × 22? (Round each number first.) (a) 4000 (b) 40000 (c) 8000 (d) 400
  31. 31.Round 13459 to the nearest hundred.
  32. 32.Round 85062 to the nearest hundred.
  33. 33.Which is closest to 798 + 595 + 295? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  34. 34.Which is closest to 1395 ÷ 19? (a) 140 (b) 700 (c) 35 (d) 70
  35. 35.Which is closest to 3194 ÷ 41? (a) 80 (b) 160 (c) 800 (d) 40
  36. 36.Which is closest to 202 × 49? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  37. 37.Which is closest to 597 + 700 + 200? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  38. 38.Round 99234 to the nearest ten.
  39. 39.Round 33.53 to one decimal place. =
  40. 40.Which is closest to 299 × 42? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000

Answer key

  1. 74.1
  2. 48000
  3. 1700
  4. 27720
  5. 12000
  6. 20000
  7. 1900
  8. 53270
  9. 32000
  10. 30300
  11. 8650
  12. 50
  13. 56000
  14. 14000
  15. 90
  16. 60
  17. 90
  18. 83000
  19. 1400
  20. 78350
  21. 1000
  22. 60
  23. 12000
  24. 25280
  25. 500
  26. 2300
  27. 62000
  28. 17200
  29. 35.3
  30. 4000
  31. 13500
  32. 85100
  33. 1700
  34. 70
  35. 80
  36. 10000
  37. 1500
  38. 99230
  39. 33.5
  40. 12000

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