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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 491 · 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 403 × 41? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  2. 2.Round 11.64 to one decimal place. =
  3. 3.Round 40745 to the nearest thousand.
  4. 4.Round 16.93 to one decimal place. =
  5. 5.Which is closest to 1204 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600
  6. 6.Which is closest to 599 × 88? (Round each number first.) (a) 5400 (b) 54000 (c) 108000 (d) 540000
  7. 7.Round 29.63 to one decimal place. =
  8. 8.Which is closest to 2707 ÷ 31? (a) 180 (b) 45 (c) 900 (d) 90
  9. 9.Round 71.67 to one decimal place. =
  10. 10.Round 26082 to the nearest thousand.
  11. 11.Which is closest to 3595 ÷ 39? (a) 180 (b) 45 (c) 90 (d) 900
  12. 12.Round 24128 to the nearest thousand.
  13. 13.Which is closest to 205 + 196 + 896? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  14. 14.Which is closest to 697 × 70? (Round each number first.) (a) 98000 (b) 49000 (c) 490000 (d) 4900
  15. 15.Which is closest to 2498 ÷ 49? (a) 25 (b) 500 (c) 100 (d) 50
  16. 16.Which is closest to 606 ÷ 31? (a) 10 (b) 40 (c) 20 (d) 200
  17. 17.Which is closest to 994 ÷ 51? (a) 40 (b) 20 (c) 200 (d) 10
  18. 18.Which is closest to 1598 ÷ 41? (a) 80 (b) 400 (c) 40 (d) 20
  19. 19.Round 48.44 to one decimal place. =
  20. 20.Which is closest to 901 × 92? (Round each number first.) (a) 810000 (b) 8100 (c) 162000 (d) 81000
  21. 21.Which is closest to 1499 ÷ 31? (a) 100 (b) 25 (c) 500 (d) 50
  22. 22.Which is closest to 696 × 49? (Round each number first.) (a) 70000 (b) 35000 (c) 350000 (d) 3500
  23. 23.Which is closest to 899 × 68? (Round each number first.) (a) 6300 (b) 126000 (c) 63000 (d) 630000
  24. 24.Which is closest to 402 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
  25. 25.Which is closest to 402 × 22? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  26. 26.Which is closest to 299 × 52? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  27. 27.Round 60.93 to one decimal place. =
  28. 28.Which is closest to 796 + 897 + 298? (a) 2100 (b) 2200 (c) 2000 (d) 1900
  29. 29.Which is closest to 1194 ÷ 39? (a) 30 (b) 15 (c) 60 (d) 300
  30. 30.Round 98477 to the nearest ten.
  31. 31.Round 30.18 to one decimal place. =
  32. 32.Round 23.61 to one decimal place. =
  33. 33.Which is closest to 101 + 398 + 899? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  34. 34.Which is closest to 305 + 404 + 697? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  35. 35.Which is closest to 497 × 58? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  36. 36.Round 40863 to the nearest ten.
  37. 37.Which is closest to 704 × 71? (Round each number first.) (a) 490000 (b) 4900 (c) 49000 (d) 98000
  38. 38.Which is closest to 798 × 22? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  39. 39.Which is closest to 500 × 81? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  40. 40.Which is closest to 96 + 498 + 502? (a) 1300 (b) 1100 (c) 1200 (d) 1000

Answer key

  1. 16000
  2. 11.6
  3. 41000
  4. 16.9
  5. 60
  6. 54000
  7. 29.6
  8. 90
  9. 71.7
  10. 26000
  11. 90
  12. 24000
  13. 1300
  14. 49000
  15. 50
  16. 20
  17. 20
  18. 40
  19. 48.4
  20. 81000
  21. 50
  22. 35000
  23. 63000
  24. 20
  25. 8000
  26. 15000
  27. 60.9
  28. 2000
  29. 30
  30. 98480
  31. 30.2
  32. 23.6
  33. 1400
  34. 1400
  35. 30000
  36. 40860
  37. 49000
  38. 16000
  39. 40000
  40. 1100

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