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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 287 · 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 29.64 to one decimal place. =
  2. 2.Which is closest to 202 × 42? (Round each number first.) (a) 8000 (b) 80000 (c) 800 (d) 16000
  3. 3.Which is closest to 500 + 796 + 898? (a) 2200 (b) 2400 (c) 2100 (d) 2300
  4. 4.Which is closest to 696 × 42? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  5. 5.Which is closest to 2006 ÷ 41? (a) 100 (b) 50 (c) 25 (d) 500
  6. 6.Which is closest to 403 × 79? (Round each number first.) (a) 320000 (b) 32000 (c) 3200 (d) 64000
  7. 7.Round 8844 to the nearest thousand.
  8. 8.Round 86.62 to one decimal place. =
  9. 9.Which is closest to 696 × 52? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  10. 10.Round 74967 to the nearest hundred.
  11. 11.Which is closest to 901 × 41? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  12. 12.Round 37289 to the nearest hundred.
  13. 13.Which is closest to 203 × 69? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  14. 14.Which is closest to 2398 ÷ 29? (a) 160 (b) 40 (c) 80 (d) 800
  15. 15.Which is closest to 497 × 41? (Round each number first.) (a) 40000 (b) 200000 (c) 20000 (d) 2000
  16. 16.Round 59714 to the nearest hundred.
  17. 17.Round 36.54 to one decimal place. =
  18. 18.Round 49815 to the nearest thousand.
  19. 19.Which is closest to 499 + 603 + 98? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  20. 20.Which is closest to 297 × 31? (Round each number first.) (a) 90000 (b) 900 (c) 9000 (d) 18000
  21. 21.Which is closest to 802 ÷ 21? (a) 80 (b) 20 (c) 400 (d) 40
  22. 22.Which is closest to 403 + 105 + 501? (a) 1100 (b) 1200 (c) 1000 (d) 900
  23. 23.Round 92281 to the nearest hundred.
  24. 24.Which is closest to 599 × 89? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  25. 25.Round 11.36 to one decimal place. =
  26. 26.Which is closest to 500 + 195 + 98? (a) 900 (b) 1000 (c) 700 (d) 800
  27. 27.Round 21.28 to one decimal place. =
  28. 28.Which is closest to 798 + 905 + 496? (a) 2100 (b) 2400 (c) 2200 (d) 2300
  29. 29.Which is closest to 298 + 896 + 697? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  30. 30.Round 51.33 to one decimal place. =
  31. 31.Round 18.77 to one decimal place. =
  32. 32.Round 88854 to the nearest thousand.
  33. 33.Round 10358 to the nearest ten.
  34. 34.Which is closest to 899 × 90? (Round each number first.) (a) 8100 (b) 810000 (c) 81000 (d) 162000
  35. 35.Which is closest to 301 + 198 + 202? (a) 800 (b) 700 (c) 900 (d) 600
  36. 36.Which is closest to 695 + 401 + 595? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  37. 37.Which is closest to 504 + 500 + 598? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  38. 38.Round 99184 to the nearest ten.
  39. 39.Which is closest to 1194 ÷ 29? (a) 400 (b) 20 (c) 40 (d) 80
  40. 40.Round 32.08 to one decimal place. =

Answer key

  1. 29.6
  2. 8000
  3. 2200
  4. 28000
  5. 50
  6. 32000
  7. 9000
  8. 86.6
  9. 35000
  10. 75000
  11. 36000
  12. 37300
  13. 14000
  14. 80
  15. 20000
  16. 59700
  17. 36.5
  18. 50000
  19. 1200
  20. 9000
  21. 40
  22. 1000
  23. 92300
  24. 54000
  25. 11.4
  26. 800
  27. 21.3
  28. 2200
  29. 1900
  30. 51.3
  31. 18.8
  32. 89000
  33. 10360
  34. 81000
  35. 700
  36. 1700
  37. 1600
  38. 99180
  39. 40
  40. 32.1

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