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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 154 · 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 900 × 18? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  2. 2.Which is closest to 396 + 95 + 100? (a) 600 (b) 700 (c) 800 (d) 500
  3. 3.Round 7278 to the nearest ten.
  4. 4.Which is closest to 996 ÷ 51? (a) 10 (b) 20 (c) 200 (d) 40
  5. 5.Which is closest to 298 × 21? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000
  6. 6.Round 42.23 to one decimal place. =
  7. 7.Which is closest to 804 ÷ 39? (a) 10 (b) 200 (c) 20 (d) 40
  8. 8.Round 64.89 to one decimal place. =
  9. 9.Round 63.51 to one decimal place. =
  10. 10.Which is closest to 501 × 32? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  11. 11.Which is closest to 198 × 50? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  12. 12.Round 45894 to the nearest thousand.
  13. 13.Which is closest to 301 × 69? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  14. 14.Which is closest to 1491 ÷ 29? (a) 100 (b) 25 (c) 500 (d) 50
  15. 15.Which is closest to 701 + 695 + 295? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  16. 16.Which is closest to 2406 ÷ 41? (a) 120 (b) 60 (c) 30 (d) 600
  17. 17.Round 98.58 to one decimal place. =
  18. 18.Round 96179 to the nearest hundred.
  19. 19.Which is closest to 2403 ÷ 39? (a) 30 (b) 60 (c) 120 (d) 600
  20. 20.Which is closest to 1409 ÷ 21? (a) 70 (b) 140 (c) 35 (d) 700
  21. 21.Which is closest to 894 ÷ 31? (a) 30 (b) 15 (c) 60 (d) 300
  22. 22.Which is closest to 896 × 42? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  23. 23.Which is closest to 903 × 89? (Round each number first.) (a) 8100 (b) 162000 (c) 810000 (d) 81000
  24. 24.Round 33999 to the nearest ten.
  25. 25.Which is closest to 1508 ÷ 49? (a) 30 (b) 300 (c) 15 (d) 60
  26. 26.Which is closest to 299 + 603 + 200? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  27. 27.Which is closest to 1194 ÷ 39? (a) 300 (b) 60 (c) 15 (d) 30
  28. 28.Round 36.71 to one decimal place. =
  29. 29.Which is closest to 899 ÷ 31? (a) 15 (b) 60 (c) 30 (d) 300
  30. 30.Which is closest to 496 + 898 + 699? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  31. 31.Which is closest to 596 ÷ 19? (a) 30 (b) 300 (c) 15 (d) 60
  32. 32.Which is closest to 3003 ÷ 49? (a) 600 (b) 120 (c) 30 (d) 60
  33. 33.Which is closest to 895 + 703 + 502? (a) 2000 (b) 2100 (c) 2300 (d) 2200
  34. 34.Round 52.43 to one decimal place. =
  35. 35.Which is closest to 698 × 91? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  36. 36.Which is closest to 296 × 40? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  37. 37.Round 14.82 to one decimal place. =
  38. 38.Round 74156 to the nearest thousand.
  39. 39.Round 92731 to the nearest ten.
  40. 40.Which is closest to 396 × 50? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000

Answer key

  1. 18000
  2. 600
  3. 7280
  4. 20
  5. 6000
  6. 42.2
  7. 20
  8. 64.9
  9. 63.5
  10. 15000
  11. 10000
  12. 46000
  13. 21000
  14. 50
  15. 1700
  16. 60
  17. 98.6
  18. 96200
  19. 60
  20. 70
  21. 30
  22. 36000
  23. 81000
  24. 34000
  25. 30
  26. 1100
  27. 30
  28. 36.7
  29. 30
  30. 2100
  31. 30
  32. 60
  33. 2100
  34. 52.4
  35. 63000
  36. 12000
  37. 14.8
  38. 74000
  39. 92730
  40. 20000

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