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Subtract 10/16 from 20/42

20/42 - 10/16 is -25/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 16 is 336
  2. For the 1st fraction, since 42 × 8 = 336,
    20/42 = 20 × 8/42 × 8 = 160/336
  3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
    10/16 = 10 × 21/16 × 21 = 210/336
  4. Subtract the two fractions:
    160/336 - 210/336 = 160 - 210/336 = -50/336
  5. After reducing the fraction, the answer is -25/168

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