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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 436 · 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 14962 to the nearest hundred.
  2. 2.Round 91.38 to one decimal place. =
  3. 3.Which is closest to 798 × 82? (Round each number first.) (a) 64000 (b) 6400 (c) 640000 (d) 128000
  4. 4.Round 23.71 to one decimal place. =
  5. 5.Which is closest to 202 + 797 + 802? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  6. 6.Which is closest to 99 + 499 + 902? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  7. 7.Which is closest to 3505 ÷ 51? (a) 700 (b) 35 (c) 140 (d) 70
  8. 8.Which is closest to 697 × 88? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  9. 9.Which is closest to 900 × 18? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  10. 10.Round 12925 to the nearest thousand.
  11. 11.Round 62.93 to one decimal place. =
  12. 12.Round 66191 to the nearest ten.
  13. 13.Which is closest to 698 + 197 + 898? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  14. 14.Which is closest to 1407 ÷ 21? (a) 700 (b) 70 (c) 35 (d) 140
  15. 15.Which is closest to 1505 ÷ 49? (a) 30 (b) 60 (c) 15 (d) 300
  16. 16.Round 19.52 to one decimal place. =
  17. 17.Which is closest to 498 × 78? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  18. 18.Which is closest to 197 × 89? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  19. 19.Which is closest to 4494 ÷ 51? (a) 45 (b) 900 (c) 90 (d) 180
  20. 20.Round 44138 to the nearest thousand.
  21. 21.Which is closest to 896 ÷ 31? (a) 300 (b) 60 (c) 30 (d) 15
  22. 22.Which is closest to 806 ÷ 19? (a) 400 (b) 20 (c) 80 (d) 40
  23. 23.Round 2664 to the nearest ten.
  24. 24.Which is closest to 393 ÷ 21? (a) 200 (b) 20 (c) 40 (d) 10
  25. 25.Round 92.72 to one decimal place. =
  26. 26.Which is closest to 1801 ÷ 31? (a) 120 (b) 30 (c) 60 (d) 600
  27. 27.Round 20.76 to one decimal place. =
  28. 28.Which is closest to 1599 ÷ 39? (a) 20 (b) 80 (c) 400 (d) 40
  29. 29.Which is closest to 503 × 69? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000
  30. 30.Which is closest to 1609 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  31. 31.Which is closest to 399 × 18? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  32. 32.Round 89039 to the nearest hundred.
  33. 33.Which is closest to 297 × 31? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  34. 34.Round 9981 to the nearest ten.
  35. 35.Round 67.47 to one decimal place. =
  36. 36.Round 24.22 to one decimal place. =
  37. 37.Round 42621 to the nearest thousand.
  38. 38.Round 91596 to the nearest ten.
  39. 39.Round 4435 to the nearest hundred.
  40. 40.Round 58.53 to one decimal place. =

Answer key

  1. 15000
  2. 91.4
  3. 64000
  4. 23.7
  5. 1800
  6. 1500
  7. 70
  8. 63000
  9. 18000
  10. 13000
  11. 62.9
  12. 66190
  13. 1800
  14. 70
  15. 30
  16. 19.5
  17. 40000
  18. 18000
  19. 90
  20. 44000
  21. 30
  22. 40
  23. 2660
  24. 20
  25. 92.7
  26. 60
  27. 20.8
  28. 40
  29. 35000
  30. 80
  31. 8000
  32. 89000
  33. 9000
  34. 9980
  35. 67.5
  36. 24.2
  37. 43000
  38. 91600
  39. 4400
  40. 58.5

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