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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 707 · 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 28.26 to one decimal place. =
  2. 2.Round 31.39 to one decimal place. =
  3. 3.Which is closest to 2098 ÷ 29? (a) 70 (b) 700 (c) 140 (d) 35
  4. 4.Which is closest to 992 ÷ 21? (a) 500 (b) 100 (c) 50 (d) 25
  5. 5.Round 25.86 to one decimal place. =
  6. 6.Which is closest to 398 × 30? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  7. 7.Round 99172 to the nearest ten.
  8. 8.Which is closest to 598 ÷ 31? (a) 10 (b) 40 (c) 200 (d) 20
  9. 9.Which is closest to 1196 ÷ 21? (a) 600 (b) 120 (c) 30 (d) 60
  10. 10.Round 47.71 to one decimal place. =
  11. 11.Which is closest to 904 ÷ 31? (a) 300 (b) 60 (c) 15 (d) 30
  12. 12.Which is closest to 396 × 19? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  13. 13.Which is closest to 3595 ÷ 41? (a) 900 (b) 45 (c) 180 (d) 90
  14. 14.Round 53.31 to one decimal place. =
  15. 15.Which is closest to 98 + 897 + 100? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  16. 16.Round 8429 to the nearest ten.
  17. 17.Which is closest to 1206 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  18. 18.Which is closest to 201 × 58? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  19. 19.Which is closest to 204 + 404 + 601? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  20. 20.Round 13.18 to one decimal place. =
  21. 21.Which is closest to 496 × 60? (Round each number first.) (a) 30000 (b) 60000 (c) 300000 (d) 3000
  22. 22.Which is closest to 201 + 305 + 899? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  23. 23.Round 68824 to the nearest thousand.
  24. 24.Which is closest to 804 × 48? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  25. 25.Round 92162 to the nearest thousand.
  26. 26.Round 89.27 to one decimal place. =
  27. 27.Round 14333 to the nearest hundred.
  28. 28.Round 20.17 to one decimal place. =
  29. 29.Round 28.73 to one decimal place. =
  30. 30.Round 76.28 to one decimal place. =
  31. 31.Round 76.59 to one decimal place. =
  32. 32.Round 53098 to the nearest hundred.
  33. 33.Which is closest to 505 + 399 + 104? (a) 900 (b) 1000 (c) 1100 (d) 1200
  34. 34.Which is closest to 397 × 32? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  35. 35.Which is closest to 392 ÷ 19? (a) 40 (b) 10 (c) 20 (d) 200
  36. 36.Which is closest to 401 ÷ 21? (a) 20 (b) 10 (c) 200 (d) 40
  37. 37.Which is closest to 901 × 81? (Round each number first.) (a) 720000 (b) 7200 (c) 72000 (d) 144000
  38. 38.Which is closest to 1505 ÷ 51? (a) 30 (b) 300 (c) 60 (d) 15
  39. 39.Round 96.61 to one decimal place. =
  40. 40.Which is closest to 901 × 19? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000

Answer key

  1. 28.3
  2. 31.4
  3. 70
  4. 50
  5. 25.9
  6. 12000
  7. 99170
  8. 20
  9. 60
  10. 47.7
  11. 30
  12. 8000
  13. 90
  14. 53.3
  15. 1100
  16. 8430
  17. 60
  18. 12000
  19. 1200
  20. 13.2
  21. 30000
  22. 1400
  23. 69000
  24. 40000
  25. 92000
  26. 89.3
  27. 14300
  28. 20.2
  29. 28.7
  30. 76.3
  31. 76.6
  32. 53100
  33. 1000
  34. 12000
  35. 20
  36. 20
  37. 72000
  38. 30
  39. 96.6
  40. 18000

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