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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 765 · 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 1007 ÷ 51? (a) 10 (b) 20 (c) 40 (d) 200
  2. 2.Round 64.86 to one decimal place. =
  3. 3.Round 15.51 to one decimal place. =
  4. 4.Which is closest to 704 + 901 + 197? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  5. 5.Which is closest to 798 × 70? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
  6. 6.Which is closest to 1991 ÷ 39? (a) 50 (b) 500 (c) 100 (d) 25
  7. 7.Which is closest to 199 × 38? (Round each number first.) (a) 8000 (b) 800 (c) 16000 (d) 80000
  8. 8.Which is closest to 1192 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
  9. 9.Which is closest to 798 × 30? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  10. 10.Which is closest to 593 ÷ 19? (a) 15 (b) 60 (c) 30 (d) 300
  11. 11.Round 46.84 to one decimal place. =
  12. 12.Which is closest to 403 × 68? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  13. 13.Which is closest to 1394 ÷ 19? (a) 35 (b) 70 (c) 140 (d) 700
  14. 14.Which is closest to 599 + 196 + 300? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  15. 15.Which is closest to 2407 ÷ 29? (a) 800 (b) 40 (c) 80 (d) 160
  16. 16.Which is closest to 198 + 700 + 199? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  17. 17.Which is closest to 898 + 95 + 95? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  18. 18.Which is closest to 398 + 499 + 703? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  19. 19.Round 13742 to the nearest ten.
  20. 20.Which is closest to 594 ÷ 19? (a) 300 (b) 60 (c) 15 (d) 30
  21. 21.Which is closest to 804 × 49? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  22. 22.Round 19.86 to one decimal place. =
  23. 23.Which is closest to 495 + 700 + 102? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  24. 24.Round 68.61 to one decimal place. =
  25. 25.Which is closest to 1191 ÷ 21? (a) 600 (b) 60 (c) 120 (d) 30
  26. 26.Round 26.48 to one decimal place. =
  27. 27.Which is closest to 300 + 304 + 397? (a) 900 (b) 1200 (c) 1100 (d) 1000
  28. 28.Round 70.86 to one decimal place. =
  29. 29.Which is closest to 3597 ÷ 41? (a) 180 (b) 90 (c) 45 (d) 900
  30. 30.Which is closest to 396 + 200 + 301? (a) 800 (b) 1100 (c) 900 (d) 1000
  31. 31.Which is closest to 897 + 202 + 101? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  32. 32.Which is closest to 404 × 29? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  33. 33.Which is closest to 598 ÷ 21? (a) 60 (b) 15 (c) 30 (d) 300
  34. 34.Round 31.86 to one decimal place. =
  35. 35.Which is closest to 200 + 696 + 697? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  36. 36.Round 64282 to the nearest hundred.
  37. 37.Which is closest to 197 × 61? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  38. 38.Which is closest to 801 × 80? (Round each number first.) (a) 640000 (b) 128000 (c) 64000 (d) 6400
  39. 39.Round 46.57 to one decimal place. =
  40. 40.Round 97094 to the nearest hundred.

Answer key

  1. 20
  2. 64.9
  3. 15.5
  4. 1800
  5. 56000
  6. 50
  7. 8000
  8. 40
  9. 24000
  10. 30
  11. 46.8
  12. 28000
  13. 70
  14. 1100
  15. 80
  16. 1100
  17. 1100
  18. 1600
  19. 13740
  20. 30
  21. 40000
  22. 19.9
  23. 1300
  24. 68.6
  25. 60
  26. 26.5
  27. 1000
  28. 70.9
  29. 90
  30. 900
  31. 1200
  32. 12000
  33. 30
  34. 31.9
  35. 1600
  36. 64300
  37. 12000
  38. 64000
  39. 46.6
  40. 97100

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