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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 863 · 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 94813 to the nearest hundred.
  2. 2.Which is closest to 902 + 903 + 800? (a) 2500 (b) 2600 (c) 2800 (d) 2700
  3. 3.Which is closest to 796 × 39? (Round each number first.) (a) 320000 (b) 32000 (c) 3200 (d) 64000
  4. 4.Round 24874 to the nearest thousand.
  5. 5.Which is closest to 1592 ÷ 19? (a) 80 (b) 800 (c) 40 (d) 160
  6. 6.Which is closest to 203 + 497 + 502? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  7. 7.Round 34431 to the nearest thousand.
  8. 8.Which is closest to 797 × 38? (Round each number first.) (a) 3200 (b) 320000 (c) 64000 (d) 32000
  9. 9.Round 43.52 to one decimal place. =
  10. 10.Which is closest to 1601 ÷ 39? (a) 80 (b) 40 (c) 400 (d) 20
  11. 11.Which is closest to 897 + 397 + 398? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  12. 12.Round 35.26 to one decimal place. =
  13. 13.Which is closest to 505 + 202 + 596? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  14. 14.Which is closest to 596 ÷ 19? (a) 300 (b) 15 (c) 30 (d) 60
  15. 15.Which is closest to 399 × 22? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  16. 16.Which is closest to 204 × 42? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
  17. 17.Which is closest to 900 × 78? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  18. 18.Round 49943 to the nearest thousand.
  19. 19.Which is closest to 496 + 97 + 701? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  20. 20.Round 46158 to the nearest ten.
  21. 21.Which is closest to 896 + 898 + 899? (a) 2800 (b) 2600 (c) 2700 (d) 2900
  22. 22.Which is closest to 2400 ÷ 29? (a) 800 (b) 160 (c) 40 (d) 80
  23. 23.Which is closest to 102 + 101 + 597? (a) 800 (b) 900 (c) 700 (d) 1000
  24. 24.Which is closest to 298 × 29? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
  25. 25.Which is closest to 596 ÷ 29? (a) 200 (b) 20 (c) 10 (d) 40
  26. 26.Round 39.77 to one decimal place. =
  27. 27.Which is closest to 2501 ÷ 51? (a) 500 (b) 100 (c) 25 (d) 50
  28. 28.Round 65064 to the nearest ten.
  29. 29.Which is closest to 698 × 28? (Round each number first.) (a) 21000 (b) 2100 (c) 210000 (d) 42000
  30. 30.Which is closest to 2493 ÷ 51? (a) 500 (b) 100 (c) 25 (d) 50
  31. 31.Round 12.51 to one decimal place. =
  32. 32.Round 55.14 to one decimal place. =
  33. 33.Round 93539 to the nearest ten.
  34. 34.Which is closest to 703 × 79? (Round each number first.) (a) 112000 (b) 560000 (c) 5600 (d) 56000
  35. 35.Which is closest to 400 × 49? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  36. 36.Which is closest to 400 + 397 + 95? (a) 900 (b) 1100 (c) 800 (d) 1000
  37. 37.Round 42.16 to one decimal place. =
  38. 38.Round 73159 to the nearest thousand.
  39. 39.Round 30149 to the nearest hundred.
  40. 40.Round 97.37 to one decimal place. =

Answer key

  1. 94800
  2. 2600
  3. 32000
  4. 25000
  5. 80
  6. 1200
  7. 34000
  8. 32000
  9. 43.5
  10. 40
  11. 1700
  12. 35.3
  13. 1300
  14. 30
  15. 8000
  16. 8000
  17. 72000
  18. 50000
  19. 1300
  20. 46160
  21. 2700
  22. 80
  23. 800
  24. 9000
  25. 20
  26. 39.8
  27. 50
  28. 65060
  29. 21000
  30. 50
  31. 12.5
  32. 55.1
  33. 93540
  34. 56000
  35. 20000
  36. 900
  37. 42.2
  38. 73000
  39. 30100
  40. 97.4

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