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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 661 · 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 897 × 28? (Round each number first.) (a) 2700 (b) 54000 (c) 270000 (d) 27000
  2. 2.Which is closest to 696 × 71? (Round each number first.) (a) 490000 (b) 49000 (c) 4900 (d) 98000
  3. 3.Which is closest to 1494 ÷ 49? (a) 60 (b) 15 (c) 30 (d) 300
  4. 4.Which is closest to 604 ÷ 29? (a) 10 (b) 200 (c) 20 (d) 40
  5. 5.Which is closest to 696 × 42? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  6. 6.Round 90.57 to one decimal place. =
  7. 7.Which is closest to 1196 ÷ 19? (a) 30 (b) 120 (c) 600 (d) 60
  8. 8.Round 27.69 to one decimal place. =
  9. 9.Round 16.12 to one decimal place. =
  10. 10.Which is closest to 395 + 603 + 696? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  11. 11.Which is closest to 2692 ÷ 29? (a) 180 (b) 90 (c) 45 (d) 900
  12. 12.Round 15.84 to one decimal place. =
  13. 13.Which is closest to 98 + 602 + 600? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  14. 14.Which is closest to 1000 ÷ 19? (a) 500 (b) 25 (c) 100 (d) 50
  15. 15.Which is closest to 396 + 398 + 403? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  16. 16.Round 23491 to the nearest thousand.
  17. 17.Round 64.08 to one decimal place. =
  18. 18.Which is closest to 799 × 80? (Round each number first.) (a) 6400 (b) 128000 (c) 64000 (d) 640000
  19. 19.Round 53.43 to one decimal place. =
  20. 20.Round 66.37 to one decimal place. =
  21. 21.Which is closest to 1208 ÷ 29? (a) 20 (b) 80 (c) 40 (d) 400
  22. 22.Which is closest to 1394 ÷ 21? (a) 35 (b) 700 (c) 70 (d) 140
  23. 23.Which is closest to 3203 ÷ 41? (a) 800 (b) 40 (c) 160 (d) 80
  24. 24.Round 30.19 to one decimal place. =
  25. 25.Which is closest to 699 × 20? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  26. 26.Round 56018 to the nearest thousand.
  27. 27.Round 92.33 to one decimal place. =
  28. 28.Round 57188 to the nearest hundred.
  29. 29.Which is closest to 804 + 395 + 295? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  30. 30.Which is closest to 304 × 31? (Round each number first.) (a) 900 (b) 9000 (c) 90000 (d) 18000
  31. 31.Round 11933 to the nearest ten.
  32. 32.Round 25.16 to one decimal place. =
  33. 33.Round 83.32 to one decimal place. =
  34. 34.Round 32.46 to one decimal place. =
  35. 35.Which is closest to 596 ÷ 19? (a) 60 (b) 30 (c) 300 (d) 15
  36. 36.Round 60596 to the nearest ten.
  37. 37.Which is closest to 904 + 102 + 598? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  38. 38.Round 70.71 to one decimal place. =
  39. 39.Which is closest to 904 × 69? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  40. 40.Round 31.54 to one decimal place. =

Answer key

  1. 27000
  2. 49000
  3. 30
  4. 20
  5. 28000
  6. 90.6
  7. 60
  8. 27.7
  9. 16.1
  10. 1700
  11. 90
  12. 15.8
  13. 1300
  14. 50
  15. 1200
  16. 23000
  17. 64.1
  18. 64000
  19. 53.4
  20. 66.4
  21. 40
  22. 70
  23. 80
  24. 30.2
  25. 14000
  26. 56000
  27. 92.3
  28. 57200
  29. 1500
  30. 9000
  31. 11930
  32. 25.2
  33. 83.3
  34. 32.5
  35. 30
  36. 60600
  37. 1600
  38. 70.7
  39. 63000
  40. 31.5

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