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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 827 · 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 497 × 89? (Round each number first.) (a) 90000 (b) 450000 (c) 45000 (d) 4500
  2. 2.Round 41.46 to one decimal place. =
  3. 3.Which is closest to 501 × 92? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  4. 4.Round 93.36 to one decimal place. =
  5. 5.Round 23.47 to one decimal place. =
  6. 6.Which is closest to 901 + 403 + 305? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  7. 7.Which is closest to 597 + 899 + 595? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  8. 8.Round 27927 to the nearest ten.
  9. 9.Which is closest to 393 ÷ 21? (a) 40 (b) 20 (c) 200 (d) 10
  10. 10.Round 37.84 to one decimal place. =
  11. 11.Round 52877 to the nearest ten.
  12. 12.Which is closest to 496 × 30? (Round each number first.) (a) 30000 (b) 15000 (c) 1500 (d) 150000
  13. 13.Which is closest to 798 + 905 + 599? (a) 2200 (b) 2300 (c) 2400 (d) 2500
  14. 14.Round 33606 to the nearest hundred.
  15. 15.Which is closest to 4002 ÷ 49? (a) 800 (b) 160 (c) 80 (d) 40
  16. 16.Which is closest to 596 × 48? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  17. 17.Which is closest to 999 ÷ 51? (a) 10 (b) 200 (c) 40 (d) 20
  18. 18.Which is closest to 1592 ÷ 21? (a) 40 (b) 800 (c) 80 (d) 160
  19. 19.Round 21790 to the nearest hundred.
  20. 20.Which is closest to 2493 ÷ 51? (a) 500 (b) 50 (c) 100 (d) 25
  21. 21.Which is closest to 105 + 305 + 498? (a) 1100 (b) 900 (c) 1000 (d) 800
  22. 22.Round 97358 to the nearest thousand.
  23. 23.Round 54.33 to one decimal place. =
  24. 24.Which is closest to 703 + 299 + 903? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  25. 25.Which is closest to 500 × 72? (Round each number first.) (a) 3500 (b) 70000 (c) 35000 (d) 350000
  26. 26.Round 50.78 to one decimal place. =
  27. 27.Which is closest to 403 + 298 + 100? (a) 700 (b) 800 (c) 1000 (d) 900
  28. 28.Round 53528 to the nearest hundred.
  29. 29.Which is closest to 599 ÷ 21? (a) 60 (b) 15 (c) 300 (d) 30
  30. 30.Which is closest to 3597 ÷ 41? (a) 180 (b) 900 (c) 45 (d) 90
  31. 31.Which is closest to 1995 ÷ 49? (a) 20 (b) 80 (c) 400 (d) 40
  32. 32.Which is closest to 595 + 296 + 500? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  33. 33.Which is closest to 205 + 196 + 903? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  34. 34.Round 69597 to the nearest hundred.
  35. 35.Which is closest to 699 × 71? (Round each number first.) (a) 49000 (b) 4900 (c) 98000 (d) 490000
  36. 36.Round 7048 to the nearest ten.
  37. 37.Which is closest to 196 × 52? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
  38. 38.Which is closest to 801 + 700 + 301? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  39. 39.Which is closest to 204 × 32? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  40. 40.Which is closest to 1399 ÷ 19? (a) 35 (b) 70 (c) 140 (d) 700

Answer key

  1. 45000
  2. 41.5
  3. 45000
  4. 93.4
  5. 23.5
  6. 1600
  7. 2100
  8. 27930
  9. 20
  10. 37.8
  11. 52880
  12. 15000
  13. 2300
  14. 33600
  15. 80
  16. 30000
  17. 20
  18. 80
  19. 21800
  20. 50
  21. 900
  22. 97000
  23. 54.3
  24. 1900
  25. 35000
  26. 50.8
  27. 800
  28. 53500
  29. 30
  30. 90
  31. 40
  32. 1400
  33. 1300
  34. 69600
  35. 49000
  36. 7050
  37. 10000
  38. 1800
  39. 6000
  40. 70

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