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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 763 · 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 698 + 796 + 204? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  2. 2.Which is closest to 396 × 49? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  3. 3.Which is closest to 808 ÷ 41? (a) 40 (b) 20 (c) 200 (d) 10
  4. 4.Round 95.07 to one decimal place. =
  5. 5.Round 63.16 to one decimal place. =
  6. 6.Which is closest to 303 × 71? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
  7. 7.Which is closest to 304 + 98 + 104? (a) 500 (b) 400 (c) 700 (d) 600
  8. 8.Which is closest to 1503 ÷ 49? (a) 300 (b) 30 (c) 60 (d) 15
  9. 9.Round 64.78 to one decimal place. =
  10. 10.Which is closest to 301 × 81? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  11. 11.Which is closest to 1799 ÷ 19? (a) 900 (b) 90 (c) 45 (d) 180
  12. 12.Which is closest to 896 + 398 + 805? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  13. 13.Round 30.57 to one decimal place. =
  14. 14.Which is closest to 201 × 60? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  15. 15.Which is closest to 596 + 895 + 103? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  16. 16.Round 30.11 to one decimal place. =
  17. 17.Round 46810 to the nearest hundred.
  18. 18.Which is closest to 101 + 103 + 798? (a) 1100 (b) 1200 (c) 900 (d) 1000
  19. 19.Which is closest to 899 × 30? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  20. 20.Round 32.79 to one decimal place. =
  21. 21.Round 89465 to the nearest thousand.
  22. 22.Round 60.52 to one decimal place. =
  23. 23.Which is closest to 2007 ÷ 41? (a) 25 (b) 50 (c) 100 (d) 500
  24. 24.Which is closest to 1006 ÷ 19? (a) 100 (b) 50 (c) 500 (d) 25
  25. 25.Round 92954 to the nearest thousand.
  26. 26.Round 15.62 to one decimal place. =
  27. 27.Which is closest to 1803 ÷ 29? (a) 600 (b) 60 (c) 120 (d) 30
  28. 28.Which is closest to 1593 ÷ 19? (a) 800 (b) 80 (c) 40 (d) 160
  29. 29.Round 82778 to the nearest ten.
  30. 30.Round 16457 to the nearest ten.
  31. 31.Round 83.36 to one decimal place. =
  32. 32.Which is closest to 402 + 396 + 97? (a) 1000 (b) 800 (c) 1100 (d) 900
  33. 33.Round 78.81 to one decimal place. =
  34. 34.Round 82.47 to one decimal place. =
  35. 35.Which is closest to 698 × 31? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  36. 36.Which is closest to 600 + 297 + 598? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  37. 37.Round 18.31 to one decimal place. =
  38. 38.Which is closest to 502 × 31? (Round each number first.) (a) 30000 (b) 15000 (c) 1500 (d) 150000
  39. 39.Round 12348 to the nearest hundred.
  40. 40.Round 29.46 to one decimal place. =

Answer key

  1. 1700
  2. 20000
  3. 20
  4. 95.1
  5. 63.2
  6. 21000
  7. 500
  8. 30
  9. 64.8
  10. 24000
  11. 90
  12. 2100
  13. 30.6
  14. 12000
  15. 1600
  16. 30.1
  17. 46800
  18. 1000
  19. 27000
  20. 32.8
  21. 89000
  22. 60.5
  23. 50
  24. 50
  25. 93000
  26. 15.6
  27. 60
  28. 80
  29. 82780
  30. 16460
  31. 83.4
  32. 900
  33. 78.8
  34. 82.5
  35. 21000
  36. 1500
  37. 18.3
  38. 15000
  39. 12300
  40. 29.5

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