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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 172 · 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 196 × 59? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  2. 2.Which is closest to 404 × 71? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  3. 3.Which is closest to 297 × 21? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  4. 4.Which is closest to 901 × 28? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700
  5. 5.Round 5929 to the nearest ten.
  6. 6.Which is closest to 897 × 22? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  7. 7.Which is closest to 396 + 202 + 496? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  8. 8.Which is closest to 796 × 39? (Round each number first.) (a) 32000 (b) 3200 (c) 320000 (d) 64000
  9. 9.Which is closest to 799 × 49? (Round each number first.) (a) 4000 (b) 400000 (c) 40000 (d) 80000
  10. 10.Which is closest to 1205 ÷ 39? (a) 15 (b) 30 (c) 300 (d) 60
  11. 11.Round 54.16 to one decimal place. =
  12. 12.Which is closest to 1799 ÷ 31? (a) 30 (b) 60 (c) 120 (d) 600
  13. 13.Round 12545 to the nearest thousand.
  14. 14.Which is closest to 296 + 302 + 802? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  15. 15.Which is closest to 205 + 395 + 799? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  16. 16.Round 42.31 to one decimal place. =
  17. 17.Round 20.38 to one decimal place. =
  18. 18.Round 60923 to the nearest ten.
  19. 19.Round 91594 to the nearest thousand.
  20. 20.Round 74697 to the nearest ten.
  21. 21.Which is closest to 2501 ÷ 49? (a) 50 (b) 500 (c) 25 (d) 100
  22. 22.Which is closest to 597 × 52? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  23. 23.Which is closest to 804 × 18? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  24. 24.Round 32.84 to one decimal place. =
  25. 25.Round 16679 to the nearest hundred.
  26. 26.Which is closest to 598 ÷ 21? (a) 60 (b) 30 (c) 300 (d) 15
  27. 27.Which is closest to 802 + 804 + 397? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  28. 28.Which is closest to 302 + 600 + 202? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  29. 29.Which is closest to 500 + 297 + 201? (a) 1000 (b) 1200 (c) 900 (d) 1100
  30. 30.Round 10818 to the nearest hundred.
  31. 31.Which is closest to 198 × 60? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  32. 32.Which is closest to 3208 ÷ 39? (a) 800 (b) 40 (c) 160 (d) 80
  33. 33.Which is closest to 1208 ÷ 21? (a) 30 (b) 120 (c) 60 (d) 600
  34. 34.Round 43.73 to one decimal place. =
  35. 35.Which is closest to 1792 ÷ 19? (a) 900 (b) 180 (c) 90 (d) 45
  36. 36.Which is closest to 803 × 18? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  37. 37.Which is closest to 1799 ÷ 29? (a) 60 (b) 30 (c) 600 (d) 120
  38. 38.Which is closest to 503 × 38? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
  39. 39.Round 54.07 to one decimal place. =
  40. 40.Which is closest to 300 + 497 + 602? (a) 1300 (b) 1600 (c) 1400 (d) 1500

Answer key

  1. 12000
  2. 28000
  3. 6000
  4. 27000
  5. 5930
  6. 18000
  7. 1100
  8. 32000
  9. 40000
  10. 30
  11. 54.2
  12. 60
  13. 13000
  14. 1400
  15. 1400
  16. 42.3
  17. 20.4
  18. 60920
  19. 92000
  20. 74700
  21. 50
  22. 30000
  23. 16000
  24. 32.8
  25. 16700
  26. 30
  27. 2000
  28. 1100
  29. 1000
  30. 10800
  31. 12000
  32. 80
  33. 60
  34. 43.7
  35. 90
  36. 16000
  37. 60
  38. 20000
  39. 54.1
  40. 1400

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