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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 953 · 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 97 + 403 + 497? (a) 1200 (b) 1100 (c) 1000 (d) 900
  2. 2.Which is closest to 300 × 42? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  3. 3.Which is closest to 4008 ÷ 51? (a) 160 (b) 800 (c) 80 (d) 40
  4. 4.Which is closest to 799 ÷ 39? (a) 200 (b) 10 (c) 40 (d) 20
  5. 5.Which is closest to 2094 ÷ 31? (a) 140 (b) 70 (c) 35 (d) 700
  6. 6.Which is closest to 897 × 48? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  7. 7.Which is closest to 1800 ÷ 31? (a) 600 (b) 30 (c) 60 (d) 120
  8. 8.Which is closest to 705 + 904 + 500? (a) 2000 (b) 2300 (c) 2200 (d) 2100
  9. 9.Which is closest to 908 ÷ 29? (a) 15 (b) 60 (c) 300 (d) 30
  10. 10.Which is closest to 598 ÷ 19? (a) 60 (b) 15 (c) 300 (d) 30
  11. 11.Which is closest to 204 × 38? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
  12. 12.Round 17.69 to one decimal place. =
  13. 13.Which is closest to 404 × 68? (Round each number first.) (a) 28000 (b) 2800 (c) 280000 (d) 56000
  14. 14.Round 60.91 to one decimal place. =
  15. 15.Round 22.34 to one decimal place. =
  16. 16.Which is closest to 800 × 79? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
  17. 17.Which is closest to 3202 ÷ 39? (a) 40 (b) 800 (c) 80 (d) 160
  18. 18.Round 60.29 to one decimal place. =
  19. 19.Round 15.37 to one decimal place. =
  20. 20.Which is closest to 303 + 503 + 895? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  21. 21.Which is closest to 97 + 902 + 195? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  22. 22.Which is closest to 197 × 49? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
  23. 23.Which is closest to 803 + 901 + 295? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  24. 24.Which is closest to 201 × 70? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  25. 25.Which is closest to 296 × 29? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
  26. 26.Round 28334 to the nearest hundred.
  27. 27.Round 53.52 to one decimal place. =
  28. 28.Which is closest to 497 × 59? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  29. 29.Round 53.44 to one decimal place. =
  30. 30.Which is closest to 897 × 51? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  31. 31.Round 21.32 to one decimal place. =
  32. 32.Which is closest to 603 + 600 + 503? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  33. 33.Which is closest to 899 × 28? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  34. 34.Which is closest to 696 × 39? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  35. 35.Round 98708 to the nearest hundred.
  36. 36.Round 76.92 to one decimal place. =
  37. 37.Round 6781 to the nearest ten.
  38. 38.Which is closest to 799 + 200 + 597? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  39. 39.Which is closest to 2000 ÷ 41? (a) 100 (b) 50 (c) 500 (d) 25
  40. 40.Round 11420 to the nearest thousand.

Answer key

  1. 1000
  2. 12000
  3. 80
  4. 20
  5. 70
  6. 45000
  7. 60
  8. 2100
  9. 30
  10. 30
  11. 8000
  12. 17.7
  13. 28000
  14. 60.9
  15. 22.3
  16. 64000
  17. 80
  18. 60.3
  19. 15.4
  20. 1700
  21. 1200
  22. 10000
  23. 2000
  24. 14000
  25. 9000
  26. 28300
  27. 53.5
  28. 30000
  29. 53.4
  30. 45000
  31. 21.3
  32. 1700
  33. 27000
  34. 28000
  35. 98700
  36. 76.9
  37. 6780
  38. 1600
  39. 50
  40. 11000

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