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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 508 · 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 697 × 40? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  2. 2.Which is closest to 500 + 698 + 305? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  3. 3.Which is closest to 996 ÷ 19? (a) 100 (b) 500 (c) 25 (d) 50
  4. 4.Which is closest to 902 × 49? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  5. 5.Which is closest to 497 × 39? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  6. 6.Round 19.56 to one decimal place. =
  7. 7.Round 43.82 to one decimal place. =
  8. 8.Which is closest to 397 × 60? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  9. 9.Round 78.56 to one decimal place. =
  10. 10.Round 53.81 to one decimal place. =
  11. 11.Which is closest to 296 + 203 + 595? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  12. 12.Round 72.43 to one decimal place. =
  13. 13.Which is closest to 2000 ÷ 51? (a) 80 (b) 20 (c) 400 (d) 40
  14. 14.Which is closest to 797 + 98 + 796? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  15. 15.Which is closest to 802 × 61? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  16. 16.Which is closest to 3501 ÷ 51? (a) 35 (b) 140 (c) 700 (d) 70
  17. 17.Which is closest to 197 + 202 + 603? (a) 900 (b) 1200 (c) 1100 (d) 1000
  18. 18.Which is closest to 3495 ÷ 49? (a) 35 (b) 70 (c) 700 (d) 140
  19. 19.Which is closest to 200 + 296 + 797? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  20. 20.Round 55.78 to one decimal place. =
  21. 21.Which is closest to 596 + 703 + 798? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  22. 22.Which is closest to 802 × 39? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
  23. 23.Which is closest to 798 × 79? (Round each number first.) (a) 128000 (b) 640000 (c) 6400 (d) 64000
  24. 24.Which is closest to 897 × 39? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  25. 25.Which is closest to 404 × 78? (Round each number first.) (a) 32000 (b) 64000 (c) 3200 (d) 320000
  26. 26.Which is closest to 601 + 695 + 704? (a) 2100 (b) 2000 (c) 2200 (d) 1900
  27. 27.Round 40125 to the nearest hundred.
  28. 28.Which is closest to 1005 ÷ 49? (a) 200 (b) 20 (c) 10 (d) 40
  29. 29.Which is closest to 300 + 301 + 205? (a) 1000 (b) 900 (c) 700 (d) 800
  30. 30.Round 33.16 to one decimal place. =
  31. 31.Round 97.53 to one decimal place. =
  32. 32.Round 72.16 to one decimal place. =
  33. 33.Which is closest to 2695 ÷ 29? (a) 180 (b) 45 (c) 900 (d) 90
  34. 34.Round 66.23 to one decimal place. =
  35. 35.Which is closest to 596 + 95 + 599? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  36. 36.Which is closest to 295 + 700 + 96? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  37. 37.Which is closest to 3508 ÷ 49? (a) 35 (b) 140 (c) 70 (d) 700
  38. 38.Which is closest to 295 + 96 + 105? (a) 700 (b) 600 (c) 500 (d) 400
  39. 39.Which is closest to 1808 ÷ 19? (a) 900 (b) 180 (c) 45 (d) 90
  40. 40.Round 82.36 to one decimal place. =

Answer key

  1. 28000
  2. 1500
  3. 50
  4. 45000
  5. 20000
  6. 19.6
  7. 43.8
  8. 24000
  9. 78.6
  10. 53.8
  11. 1100
  12. 72.4
  13. 40
  14. 1700
  15. 48000
  16. 70
  17. 1000
  18. 70
  19. 1300
  20. 55.8
  21. 2100
  22. 32000
  23. 64000
  24. 36000
  25. 32000
  26. 2000
  27. 40100
  28. 20
  29. 800
  30. 33.2
  31. 97.5
  32. 72.2
  33. 90
  34. 66.2
  35. 1300
  36. 1100
  37. 70
  38. 500
  39. 90
  40. 82.4

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