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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 833 · 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 898 × 38? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  2. 2.Round 91498 to the nearest hundred.
  3. 3.Which is closest to 1800 ÷ 29? (a) 120 (b) 30 (c) 60 (d) 600
  4. 4.Which is closest to 497 + 298 + 498? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  5. 5.Which is closest to 893 ÷ 31? (a) 15 (b) 30 (c) 300 (d) 60
  6. 6.Round 13.32 to one decimal place. =
  7. 7.Round 98.17 to one decimal place. =
  8. 8.Which is closest to 197 × 81? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  9. 9.Which is closest to 895 + 699 + 496? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  10. 10.Which is closest to 2702 ÷ 31? (a) 180 (b) 90 (c) 45 (d) 900
  11. 11.Which is closest to 500 + 197 + 600? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  12. 12.Which is closest to 1991 ÷ 39? (a) 50 (b) 500 (c) 100 (d) 25
  13. 13.Which is closest to 409 ÷ 21? (a) 20 (b) 10 (c) 40 (d) 200
  14. 14.Round 42927 to the nearest ten.
  15. 15.Round 92363 to the nearest thousand.
  16. 16.Which is closest to 3599 ÷ 41? (a) 180 (b) 90 (c) 900 (d) 45
  17. 17.Which is closest to 1199 ÷ 31? (a) 400 (b) 80 (c) 40 (d) 20
  18. 18.Which is closest to 897 × 31? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  19. 19.Which is closest to 305 + 397 + 98? (a) 900 (b) 700 (c) 1000 (d) 800
  20. 20.Which is closest to 705 + 296 + 499? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  21. 21.Which is closest to 499 × 29? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  22. 22.Which is closest to 599 ÷ 29? (a) 40 (b) 200 (c) 10 (d) 20
  23. 23.Which is closest to 202 + 696 + 502? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  24. 24.Which is closest to 901 + 397 + 905? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  25. 25.Which is closest to 304 × 22? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  26. 26.Round 20684 to the nearest ten.
  27. 27.Round 94161 to the nearest thousand.
  28. 28.Round 68738 to the nearest ten.
  29. 29.Which is closest to 3507 ÷ 49? (a) 140 (b) 35 (c) 70 (d) 700
  30. 30.Round 25.71 to one decimal place. =
  31. 31.Which is closest to 796 × 21? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  32. 32.Round 62.94 to one decimal place. =
  33. 33.Round 88602 to the nearest ten.
  34. 34.Which is closest to 798 ÷ 21? (a) 400 (b) 20 (c) 80 (d) 40
  35. 35.Which is closest to 896 + 696 + 596? (a) 2100 (b) 2400 (c) 2300 (d) 2200
  36. 36.Round 44.77 to one decimal place. =
  37. 37.Which is closest to 904 × 19? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  38. 38.Which is closest to 1507 ÷ 29? (a) 25 (b) 100 (c) 50 (d) 500
  39. 39.Which is closest to 198 + 896 + 795? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  40. 40.Round 7739 to the nearest ten.

Answer key

  1. 36000
  2. 91500
  3. 60
  4. 1300
  5. 30
  6. 13.3
  7. 98.2
  8. 16000
  9. 2100
  10. 90
  11. 1300
  12. 50
  13. 20
  14. 42930
  15. 92000
  16. 90
  17. 40
  18. 27000
  19. 800
  20. 1500
  21. 15000
  22. 20
  23. 1400
  24. 2200
  25. 6000
  26. 20680
  27. 94000
  28. 68740
  29. 70
  30. 25.7
  31. 16000
  32. 62.9
  33. 88600
  34. 40
  35. 2200
  36. 44.8
  37. 18000
  38. 50
  39. 1900
  40. 7740

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