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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 644 · 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 1204 ÷ 29? (a) 400 (b) 20 (c) 80 (d) 40
  2. 2.Which is closest to 902 × 71? (Round each number first.) (a) 630000 (b) 126000 (c) 63000 (d) 6300
  3. 3.Which is closest to 396 + 603 + 896? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  4. 4.Which is closest to 302 × 20? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  5. 5.Round 72.08 to one decimal place. =
  6. 6.Which is closest to 903 × 31? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  7. 7.Which is closest to 196 + 603 + 195? (a) 900 (b) 1000 (c) 1200 (d) 1100
  8. 8.Which is closest to 2000 ÷ 49? (a) 80 (b) 20 (c) 40 (d) 400
  9. 9.Which is closest to 1200 ÷ 29? (a) 80 (b) 40 (c) 400 (d) 20
  10. 10.Which is closest to 896 × 88? (Round each number first.) (a) 8100 (b) 810000 (c) 81000 (d) 162000
  11. 11.Which is closest to 2498 ÷ 49? (a) 25 (b) 500 (c) 50 (d) 100
  12. 12.Which is closest to 398 + 696 + 901? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  13. 13.Which is closest to 799 × 39? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  14. 14.Which is closest to 4009 ÷ 51? (a) 40 (b) 160 (c) 80 (d) 800
  15. 15.Which is closest to 201 × 51? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
  16. 16.Which is closest to 202 + 101 + 298? (a) 700 (b) 600 (c) 800 (d) 500
  17. 17.Which is closest to 696 + 401 + 103? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  18. 18.Which is closest to 504 × 38? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  19. 19.Which is closest to 903 × 91? (Round each number first.) (a) 8100 (b) 162000 (c) 810000 (d) 81000
  20. 20.Which is closest to 1503 ÷ 31? (a) 25 (b) 50 (c) 500 (d) 100
  21. 21.Which is closest to 100 + 799 + 403? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  22. 22.Which is closest to 1208 ÷ 21? (a) 600 (b) 60 (c) 120 (d) 30
  23. 23.Which is closest to 1797 ÷ 29? (a) 600 (b) 30 (c) 120 (d) 60
  24. 24.Round 60078 to the nearest hundred.
  25. 25.Which is closest to 796 ÷ 19? (a) 20 (b) 80 (c) 400 (d) 40
  26. 26.Which is closest to 904 × 59? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  27. 27.Which is closest to 1609 ÷ 41? (a) 400 (b) 80 (c) 20 (d) 40
  28. 28.Round 46.58 to one decimal place. =
  29. 29.Which is closest to 197 × 59? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  30. 30.Which is closest to 704 × 18? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  31. 31.Round 28059 to the nearest hundred.
  32. 32.Round 86.61 to one decimal place. =
  33. 33.Round 49.73 to one decimal place. =
  34. 34.Round 46.63 to one decimal place. =
  35. 35.Round 34166 to the nearest ten.
  36. 36.Which is closest to 1602 ÷ 21? (a) 800 (b) 160 (c) 80 (d) 40
  37. 37.Round 90.47 to one decimal place. =
  38. 38.Round 2498 to the nearest ten.
  39. 39.Which is closest to 804 + 97 + 97? (a) 1000 (b) 1200 (c) 900 (d) 1100
  40. 40.Which is closest to 298 × 49? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000

Answer key

  1. 40
  2. 63000
  3. 1900
  4. 6000
  5. 72.1
  6. 27000
  7. 1000
  8. 40
  9. 40
  10. 81000
  11. 50
  12. 2000
  13. 32000
  14. 80
  15. 10000
  16. 600
  17. 1200
  18. 20000
  19. 81000
  20. 50
  21. 1300
  22. 60
  23. 60
  24. 60100
  25. 40
  26. 54000
  27. 40
  28. 46.6
  29. 12000
  30. 14000
  31. 28100
  32. 86.6
  33. 49.7
  34. 46.6
  35. 34170
  36. 80
  37. 90.5
  38. 2500
  39. 1000
  40. 15000

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