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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 259 · 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 78.61 to one decimal place. =
  2. 2.Round 56.37 to one decimal place. =
  3. 3.Round 61124 to the nearest hundred.
  4. 4.Which is closest to 304 + 696 + 102? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  5. 5.Which is closest to 903 × 80? (Round each number first.) (a) 72000 (b) 720000 (c) 144000 (d) 7200
  6. 6.Which is closest to 797 × 48? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  7. 7.Round 97.39 to one decimal place. =
  8. 8.Which is closest to 696 + 697 + 801? (a) 2400 (b) 2100 (c) 2200 (d) 2300
  9. 9.Round 64785 to the nearest hundred.
  10. 10.Which is closest to 201 + 905 + 104? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  11. 11.Round 55828 to the nearest thousand.
  12. 12.Round 80491 to the nearest thousand.
  13. 13.Round 59881 to the nearest thousand.
  14. 14.Which is closest to 501 × 72? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  15. 15.Which is closest to 95 + 602 + 401? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  16. 16.Which is closest to 899 × 70? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  17. 17.Which is closest to 301 × 61? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  18. 18.Round 48.51 to one decimal place. =
  19. 19.Which is closest to 2704 ÷ 29? (a) 45 (b) 180 (c) 90 (d) 900
  20. 20.Which is closest to 1593 ÷ 21? (a) 160 (b) 800 (c) 80 (d) 40
  21. 21.Which is closest to 1208 ÷ 21? (a) 60 (b) 120 (c) 600 (d) 30
  22. 22.Round 39308 to the nearest thousand.
  23. 23.Which is closest to 301 + 904 + 402? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  24. 24.Which is closest to 1191 ÷ 39? (a) 30 (b) 60 (c) 300 (d) 15
  25. 25.Round 30984 to the nearest ten.
  26. 26.Round 21.68 to one decimal place. =
  27. 27.Which is closest to 303 + 199 + 195? (a) 600 (b) 800 (c) 900 (d) 700
  28. 28.Round 71.26 to one decimal place. =
  29. 29.Which is closest to 200 × 29? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  30. 30.Which is closest to 1496 ÷ 51? (a) 15 (b) 300 (c) 60 (d) 30
  31. 31.Which is closest to 198 × 20? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  32. 32.Which is closest to 704 × 90? (Round each number first.) (a) 63000 (b) 6300 (c) 630000 (d) 126000
  33. 33.Which is closest to 1002 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
  34. 34.Round 55572 to the nearest ten.
  35. 35.Which is closest to 697 + 295 + 798? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  36. 36.Round 76623 to the nearest thousand.
  37. 37.Which is closest to 398 × 80? (Round each number first.) (a) 32000 (b) 3200 (c) 320000 (d) 64000
  38. 38.Round 93.68 to one decimal place. =
  39. 39.Round 16.22 to one decimal place. =
  40. 40.Round 73.38 to one decimal place. =

Answer key

  1. 78.6
  2. 56.4
  3. 61100
  4. 1100
  5. 72000
  6. 40000
  7. 97.4
  8. 2200
  9. 64800
  10. 1200
  11. 56000
  12. 80000
  13. 60000
  14. 35000
  15. 1100
  16. 63000
  17. 18000
  18. 48.5
  19. 90
  20. 80
  21. 60
  22. 39000
  23. 1600
  24. 30
  25. 30980
  26. 21.7
  27. 700
  28. 71.3
  29. 6000
  30. 30
  31. 4000
  32. 63000
  33. 20
  34. 55570
  35. 1800
  36. 77000
  37. 32000
  38. 93.7
  39. 16.2
  40. 73.4

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