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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 901 · 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.Round 24131 to the nearest thousand.
  2. 2.Round 39.76 to one decimal place. =
  3. 3.Which is closest to 496 × 48? (Round each number first.) (a) 2500 (b) 50000 (c) 250000 (d) 25000
  4. 4.Which is closest to 794 ÷ 41? (a) 10 (b) 200 (c) 40 (d) 20
  5. 5.Which is closest to 905 + 499 + 895? (a) 2500 (b) 2300 (c) 2200 (d) 2400
  6. 6.Which is closest to 2107 ÷ 29? (a) 70 (b) 35 (c) 140 (d) 700
  7. 7.Which is closest to 907 ÷ 29? (a) 30 (b) 60 (c) 15 (d) 300
  8. 8.Which is closest to 897 × 21? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  9. 9.Which is closest to 599 × 30? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  10. 10.Which is closest to 803 × 88? (Round each number first.) (a) 720000 (b) 7200 (c) 72000 (d) 144000
  11. 11.Which is closest to 95 + 605 + 904? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  12. 12.Round 23.24 to one decimal place. =
  13. 13.Which is closest to 698 + 595 + 204? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  14. 14.Round 60.26 to one decimal place. =
  15. 15.Which is closest to 3007 ÷ 51? (a) 600 (b) 120 (c) 30 (d) 60
  16. 16.Which is closest to 699 + 103 + 601? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  17. 17.Which is closest to 502 × 78? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  18. 18.Which is closest to 902 + 695 + 205? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  19. 19.Round 1318 to the nearest ten.
  20. 20.Round 16.23 to one decimal place. =
  21. 21.Which is closest to 404 × 90? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  22. 22.Round 65087 to the nearest thousand.
  23. 23.Which is closest to 900 × 18? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  24. 24.Which is closest to 1195 ÷ 29? (a) 20 (b) 400 (c) 40 (d) 80
  25. 25.Which is closest to 904 × 30? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  26. 26.Round 25.74 to one decimal place. =
  27. 27.Which is closest to 701 + 205 + 504? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  28. 28.Round 18.28 to one decimal place. =
  29. 29.Which is closest to 796 × 60? (Round each number first.) (a) 96000 (b) 4800 (c) 480000 (d) 48000
  30. 30.Which is closest to 696 × 19? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  31. 31.Round 16806 to the nearest thousand.
  32. 32.Which is closest to 197 + 896 + 798? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  33. 33.Round 37.29 to one decimal place. =
  34. 34.Which is closest to 704 × 18? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  35. 35.Round 75657 to the nearest ten.
  36. 36.Which is closest to 497 × 81? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  37. 37.Which is closest to 2993 ÷ 51? (a) 60 (b) 120 (c) 600 (d) 30
  38. 38.Round 69.28 to one decimal place. =
  39. 39.Which is closest to 98 + 100 + 595? (a) 900 (b) 1000 (c) 800 (d) 700
  40. 40.Which is closest to 795 ÷ 41? (a) 20 (b) 40 (c) 10 (d) 200

Answer key

  1. 24000
  2. 39.8
  3. 25000
  4. 20
  5. 2300
  6. 70
  7. 30
  8. 18000
  9. 18000
  10. 72000
  11. 1600
  12. 23.2
  13. 1500
  14. 60.3
  15. 60
  16. 1400
  17. 40000
  18. 1800
  19. 1320
  20. 16.2
  21. 36000
  22. 65000
  23. 18000
  24. 40
  25. 27000
  26. 25.7
  27. 1400
  28. 18.3
  29. 48000
  30. 14000
  31. 17000
  32. 1900
  33. 37.3
  34. 14000
  35. 75660
  36. 40000
  37. 60
  38. 69.3
  39. 800
  40. 20

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