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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 307 · 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 1809 ÷ 19? (a) 90 (b) 180 (c) 45 (d) 900
  2. 2.Which is closest to 1806 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120
  3. 3.Which is closest to 699 + 98 + 102? (a) 800 (b) 1000 (c) 900 (d) 1100
  4. 4.Round 51.43 to one decimal place. =
  5. 5.Round 51.84 to one decimal place. =
  6. 6.Which is closest to 400 × 49? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  7. 7.Which is closest to 496 × 29? (Round each number first.) (a) 1500 (b) 15000 (c) 150000 (d) 30000
  8. 8.Round 1518 to the nearest thousand.
  9. 9.Round 11092 to the nearest hundred.
  10. 10.Which is closest to 999 ÷ 51? (a) 40 (b) 10 (c) 200 (d) 20
  11. 11.Which is closest to 601 + 303 + 600? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  12. 12.Round 96139 to the nearest thousand.
  13. 13.Round 87531 to the nearest thousand.
  14. 14.Which is closest to 301 + 97 + 303? (a) 600 (b) 800 (c) 900 (d) 700
  15. 15.Round 48.83 to one decimal place. =
  16. 16.Which is closest to 800 × 48? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  17. 17.Round 14.68 to one decimal place. =
  18. 18.Which is closest to 903 × 48? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  19. 19.Which is closest to 696 × 21? (Round each number first.) (a) 14000 (b) 28000 (c) 1400 (d) 140000
  20. 20.Round 15474 to the nearest thousand.
  21. 21.Which is closest to 301 + 202 + 800? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  22. 22.Which is closest to 495 + 901 + 103? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  23. 23.Which is closest to 1596 ÷ 19? (a) 80 (b) 40 (c) 160 (d) 800
  24. 24.Which is closest to 4003 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  25. 25.Round 57.48 to one decimal place. =
  26. 26.Round 73.08 to one decimal place. =
  27. 27.Round 69268 to the nearest hundred.
  28. 28.Round 13.06 to one decimal place. =
  29. 29.Which is closest to 797 ÷ 21? (a) 400 (b) 20 (c) 80 (d) 40
  30. 30.Which is closest to 104 + 297 + 304? (a) 600 (b) 700 (c) 800 (d) 900
  31. 31.Which is closest to 796 × 22? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  32. 32.Which is closest to 1195 ÷ 41? (a) 300 (b) 60 (c) 30 (d) 15
  33. 33.Which is closest to 801 × 78? (Round each number first.) (a) 64000 (b) 6400 (c) 640000 (d) 128000
  34. 34.Round 86.09 to one decimal place. =
  35. 35.Which is closest to 2791 ÷ 41? (a) 35 (b) 700 (c) 140 (d) 70
  36. 36.Which is closest to 1793 ÷ 19? (a) 90 (b) 900 (c) 45 (d) 180
  37. 37.Round 52.92 to one decimal place. =
  38. 38.Round 55156 to the nearest ten.
  39. 39.Round 36.49 to one decimal place. =
  40. 40.Which is closest to 1806 ÷ 29? (a) 60 (b) 120 (c) 600 (d) 30

Answer key

  1. 90
  2. 60
  3. 900
  4. 51.4
  5. 51.8
  6. 20000
  7. 15000
  8. 2000
  9. 11100
  10. 20
  11. 1500
  12. 96000
  13. 88000
  14. 700
  15. 48.8
  16. 40000
  17. 14.7
  18. 45000
  19. 14000
  20. 15000
  21. 1300
  22. 1500
  23. 80
  24. 80
  25. 57.5
  26. 73.1
  27. 69300
  28. 13.1
  29. 40
  30. 700
  31. 16000
  32. 30
  33. 64000
  34. 86.1
  35. 70
  36. 90
  37. 52.9
  38. 55160
  39. 36.5
  40. 60

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