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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 181 · 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 1794 ÷ 19? (a) 45 (b) 180 (c) 90 (d) 900
  2. 2.Round 62.48 to one decimal place. =
  3. 3.Round 80434 to the nearest hundred.
  4. 4.Which is closest to 99 + 801 + 596? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  5. 5.Which is closest to 403 + 403 + 895? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  6. 6.Which is closest to 497 × 30? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  7. 7.Round 40.23 to one decimal place. =
  8. 8.Which is closest to 1502 ÷ 31? (a) 50 (b) 100 (c) 500 (d) 25
  9. 9.Which is closest to 2492 ÷ 49? (a) 100 (b) 50 (c) 25 (d) 500
  10. 10.Which is closest to 199 × 68? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  11. 11.Which is closest to 2700 ÷ 31? (a) 180 (b) 900 (c) 90 (d) 45
  12. 12.Round 61.77 to one decimal place. =
  13. 13.Which is closest to 802 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  14. 14.Which is closest to 599 × 78? (Round each number first.) (a) 480000 (b) 4800 (c) 48000 (d) 96000
  15. 15.Which is closest to 901 × 19? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  16. 16.Which is closest to 2494 ÷ 51? (a) 25 (b) 100 (c) 500 (d) 50
  17. 17.Round 19604 to the nearest thousand.
  18. 18.Which is closest to 605 + 598 + 404? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  19. 19.Which is closest to 704 + 796 + 98? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  20. 20.Round 86.33 to one decimal place. =
  21. 21.Which is closest to 796 × 79? (Round each number first.) (a) 640000 (b) 64000 (c) 6400 (d) 128000
  22. 22.Which is closest to 397 × 82? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
  23. 23.Which is closest to 1001 ÷ 21? (a) 500 (b) 100 (c) 25 (d) 50
  24. 24.Which is closest to 3601 ÷ 39? (a) 90 (b) 900 (c) 45 (d) 180
  25. 25.Which is closest to 2695 ÷ 31? (a) 900 (b) 90 (c) 45 (d) 180
  26. 26.Which is closest to 898 + 405 + 202? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  27. 27.Which is closest to 399 + 395 + 797? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  28. 28.Round 26422 to the nearest hundred.
  29. 29.Round 95.48 to one decimal place. =
  30. 30.Which is closest to 1209 ÷ 29? (a) 400 (b) 80 (c) 20 (d) 40
  31. 31.Which is closest to 204 × 88? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  32. 32.Which is closest to 1002 ÷ 49? (a) 10 (b) 20 (c) 40 (d) 200
  33. 33.Round 59862 to the nearest thousand.
  34. 34.Which is closest to 2402 ÷ 31? (a) 800 (b) 160 (c) 40 (d) 80
  35. 35.Which is closest to 399 + 603 + 498? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  36. 36.Round 68.93 to one decimal place. =
  37. 37.Which is closest to 395 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  38. 38.Round 78.79 to one decimal place. =
  39. 39.Round 80.32 to one decimal place. =
  40. 40.Which is closest to 403 + 597 + 902? (a) 1800 (b) 2000 (c) 1900 (d) 2100

Answer key

  1. 90
  2. 62.5
  3. 80400
  4. 1500
  5. 1700
  6. 15000
  7. 40.2
  8. 50
  9. 50
  10. 14000
  11. 90
  12. 61.8
  13. 24000
  14. 48000
  15. 18000
  16. 50
  17. 20000
  18. 1600
  19. 1600
  20. 86.3
  21. 64000
  22. 32000
  23. 50
  24. 90
  25. 90
  26. 1500
  27. 1600
  28. 26400
  29. 95.5
  30. 40
  31. 18000
  32. 20
  33. 60000
  34. 80
  35. 1500
  36. 68.9
  37. 20
  38. 78.8
  39. 80.3
  40. 1900

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