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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 177 · 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 33.09 to one decimal place. =
  2. 2.Round 90162 to the nearest hundred.
  3. 3.Which is closest to 300 × 92? (Round each number first.) (a) 2700 (b) 27000 (c) 270000 (d) 54000
  4. 4.Round 83.54 to one decimal place. =
  5. 5.Which is closest to 1192 ÷ 29? (a) 20 (b) 400 (c) 40 (d) 80
  6. 6.Which is closest to 204 + 595 + 105? (a) 800 (b) 900 (c) 1000 (d) 1100
  7. 7.Which is closest to 204 × 91? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  8. 8.Which is closest to 1592 ÷ 39? (a) 400 (b) 80 (c) 40 (d) 20
  9. 9.Which is closest to 2499 ÷ 49? (a) 100 (b) 25 (c) 50 (d) 500
  10. 10.Which is closest to 901 + 897 + 900? (a) 2600 (b) 2800 (c) 2900 (d) 2700
  11. 11.Which is closest to 195 + 699 + 798? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  12. 12.Round 17747 to the nearest ten.
  13. 13.Round 51.66 to one decimal place. =
  14. 14.Round 26039 to the nearest thousand.
  15. 15.Round 7286 to the nearest hundred.
  16. 16.Which is closest to 896 + 603 + 401? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  17. 17.Round 40923 to the nearest thousand.
  18. 18.Round 97220 to the nearest thousand.
  19. 19.Round 73544 to the nearest thousand.
  20. 20.Which is closest to 498 × 72? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  21. 21.Round 32.52 to one decimal place. =
  22. 22.Round 33495 to the nearest thousand.
  23. 23.Which is closest to 203 + 202 + 904? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  24. 24.Round 77756 to the nearest ten.
  25. 25.Which is closest to 2706 ÷ 29? (a) 900 (b) 180 (c) 45 (d) 90
  26. 26.Round 20749 to the nearest ten.
  27. 27.Which is closest to 1592 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  28. 28.Round 66491 to the nearest ten.
  29. 29.Which is closest to 898 × 88? (Round each number first.) (a) 162000 (b) 81000 (c) 810000 (d) 8100
  30. 30.Which is closest to 1604 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  31. 31.Which is closest to 798 × 79? (Round each number first.) (a) 640000 (b) 64000 (c) 128000 (d) 6400
  32. 32.Round 13.87 to one decimal place. =
  33. 33.Round 81.52 to one decimal place. =
  34. 34.Which is closest to 100 + 598 + 295? (a) 1000 (b) 900 (c) 1100 (d) 1200
  35. 35.Which is closest to 992 ÷ 19? (a) 50 (b) 100 (c) 500 (d) 25
  36. 36.Round 28.37 to one decimal place. =
  37. 37.Round 47652 to the nearest hundred.
  38. 38.Round 37.48 to one decimal place. =
  39. 39.Which is closest to 198 × 71? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  40. 40.Which is closest to 1798 ÷ 31? (a) 60 (b) 600 (c) 120 (d) 30

Answer key

  1. 33.1
  2. 90200
  3. 27000
  4. 83.5
  5. 40
  6. 900
  7. 18000
  8. 40
  9. 50
  10. 2700
  11. 1700
  12. 17750
  13. 51.7
  14. 26000
  15. 7300
  16. 1900
  17. 41000
  18. 97000
  19. 74000
  20. 35000
  21. 32.5
  22. 33000
  23. 1300
  24. 77760
  25. 90
  26. 20750
  27. 80
  28. 66490
  29. 81000
  30. 40
  31. 64000
  32. 13.9
  33. 81.5
  34. 1000
  35. 50
  36. 28.4
  37. 47700
  38. 37.5
  39. 14000
  40. 60

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