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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 168 · 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 904 × 19? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  2. 2.Round 46020 to the nearest hundred.
  3. 3.Which is closest to 297 × 82? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  4. 4.Round 62.44 to one decimal place. =
  5. 5.Which is closest to 402 × 31? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  6. 6.Round 30.19 to one decimal place. =
  7. 7.Round 76.73 to one decimal place. =
  8. 8.Round 88.86 to one decimal place. =
  9. 9.Which is closest to 793 ÷ 41? (a) 40 (b) 200 (c) 10 (d) 20
  10. 10.Which is closest to 601 × 92? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  11. 11.Which is closest to 296 + 703 + 698? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  12. 12.Round 25.88 to one decimal place. =
  13. 13.Round 48.89 to one decimal place. =
  14. 14.Which is closest to 901 + 401 + 904? (a) 2300 (b) 2200 (c) 2400 (d) 2100
  15. 15.Which is closest to 1804 ÷ 31? (a) 60 (b) 30 (c) 120 (d) 600
  16. 16.Round 27849 to the nearest ten.
  17. 17.Which is closest to 699 + 803 + 496? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  18. 18.Which is closest to 102 + 398 + 398? (a) 900 (b) 1100 (c) 800 (d) 1000
  19. 19.Which is closest to 897 ÷ 29? (a) 15 (b) 300 (c) 60 (d) 30
  20. 20.Round 34444 to the nearest ten.
  21. 21.Round 80.12 to one decimal place. =
  22. 22.Which is closest to 801 + 697 + 299? (a) 1800 (b) 1700 (c) 2000 (d) 1900
  23. 23.Which is closest to 901 × 69? (Round each number first.) (a) 6300 (b) 630000 (c) 126000 (d) 63000
  24. 24.Which is closest to 809 ÷ 39? (a) 20 (b) 200 (c) 40 (d) 10
  25. 25.Which is closest to 696 + 302 + 697? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  26. 26.Which is closest to 204 + 600 + 597? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  27. 27.Which is closest to 204 + 195 + 299? (a) 700 (b) 900 (c) 800 (d) 600
  28. 28.Which is closest to 701 × 68? (Round each number first.) (a) 98000 (b) 49000 (c) 490000 (d) 4900
  29. 29.Which is closest to 2391 ÷ 31? (a) 160 (b) 80 (c) 40 (d) 800
  30. 30.Which is closest to 3608 ÷ 39? (a) 180 (b) 90 (c) 900 (d) 45
  31. 31.Which is closest to 796 × 89? (Round each number first.) (a) 7200 (b) 72000 (c) 144000 (d) 720000
  32. 32.Which is closest to 597 + 102 + 398? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  33. 33.Round 11.08 to one decimal place. =
  34. 34.Which is closest to 704 × 30? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  35. 35.Round 27.11 to one decimal place. =
  36. 36.Which is closest to 899 + 399 + 702? (a) 2000 (b) 2100 (c) 1900 (d) 2200
  37. 37.Which is closest to 298 × 21? (Round each number first.) (a) 6000 (b) 12000 (c) 600 (d) 60000
  38. 38.Round 46.74 to one decimal place. =
  39. 39.Which is closest to 1193 ÷ 29? (a) 20 (b) 80 (c) 40 (d) 400
  40. 40.Which is closest to 2406 ÷ 39? (a) 600 (b) 60 (c) 120 (d) 30

Answer key

  1. 18000
  2. 46000
  3. 24000
  4. 62.4
  5. 12000
  6. 30.2
  7. 76.7
  8. 88.9
  9. 20
  10. 54000
  11. 1700
  12. 25.9
  13. 48.9
  14. 2200
  15. 60
  16. 27850
  17. 2000
  18. 900
  19. 30
  20. 34440
  21. 80.1
  22. 1800
  23. 63000
  24. 20
  25. 1700
  26. 1400
  27. 700
  28. 49000
  29. 80
  30. 90
  31. 72000
  32. 1100
  33. 11.1
  34. 21000
  35. 27.1
  36. 2000
  37. 6000
  38. 46.7
  39. 40
  40. 60

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