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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 505 · 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 302 + 199 + 104? (a) 700 (b) 500 (c) 600 (d) 800
  2. 2.Which is closest to 897 × 20? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  3. 3.Round 15455 to the nearest thousand.
  4. 4.Which is closest to 400 + 903 + 297? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  5. 5.Which is closest to 502 + 699 + 801? (a) 2100 (b) 1900 (c) 2000 (d) 2200
  6. 6.Round 88211 to the nearest thousand.
  7. 7.Which is closest to 904 × 70? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  8. 8.Which is closest to 1200 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
  9. 9.Which is closest to 598 ÷ 31? (a) 10 (b) 20 (c) 40 (d) 200
  10. 10.Which is closest to 897 × 40? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  11. 11.Round 21.93 to one decimal place. =
  12. 12.Round 56591 to the nearest ten.
  13. 13.Which is closest to 897 + 402 + 899? (a) 2100 (b) 2200 (c) 2300 (d) 2400
  14. 14.Which is closest to 1598 ÷ 21? (a) 40 (b) 80 (c) 800 (d) 160
  15. 15.Round 79.21 to one decimal place. =
  16. 16.Which is closest to 496 × 32? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
  17. 17.Round 67.12 to one decimal place. =
  18. 18.Which is closest to 403 + 402 + 295? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  19. 19.Which is closest to 604 × 51? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  20. 20.Which is closest to 601 × 20? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  21. 21.Round 50.64 to one decimal place. =
  22. 22.Round 18079 to the nearest ten.
  23. 23.Which is closest to 2692 ÷ 29? (a) 180 (b) 90 (c) 900 (d) 45
  24. 24.Round 23135 to the nearest thousand.
  25. 25.Which is closest to 898 + 500 + 804? (a) 2300 (b) 2200 (c) 2400 (d) 2100
  26. 26.Which is closest to 595 + 296 + 197? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  27. 27.Round 50.66 to one decimal place. =
  28. 28.Which is closest to 2395 ÷ 31? (a) 80 (b) 160 (c) 800 (d) 40
  29. 29.Which is closest to 303 × 29? (Round each number first.) (a) 18000 (b) 90000 (c) 9000 (d) 900
  30. 30.Round 20055 to the nearest thousand.
  31. 31.Round 57.71 to one decimal place. =
  32. 32.Round 92.89 to one decimal place. =
  33. 33.Which is closest to 400 + 496 + 905? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  34. 34.Round 26.73 to one decimal place. =
  35. 35.Round 26.66 to one decimal place. =
  36. 36.Which is closest to 600 × 21? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  37. 37.Round 93.38 to one decimal place. =
  38. 38.Which is closest to 3602 ÷ 39? (a) 45 (b) 900 (c) 180 (d) 90
  39. 39.Which is closest to 196 × 61? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  40. 40.Which is closest to 2400 ÷ 29? (a) 40 (b) 800 (c) 160 (d) 80

Answer key

  1. 600
  2. 18000
  3. 15000
  4. 1600
  5. 2000
  6. 88000
  7. 63000
  8. 40
  9. 20
  10. 36000
  11. 21.9
  12. 56590
  13. 2200
  14. 80
  15. 79.2
  16. 15000
  17. 67.1
  18. 1100
  19. 30000
  20. 12000
  21. 50.6
  22. 18080
  23. 90
  24. 23000
  25. 2200
  26. 1100
  27. 50.7
  28. 80
  29. 9000
  30. 20000
  31. 57.7
  32. 92.9
  33. 1800
  34. 26.7
  35. 26.7
  36. 12000
  37. 93.4
  38. 90
  39. 12000
  40. 80

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