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Subtract 18/42 from 18/56

18/56 - 18/42 is -3/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 42 is 168
  2. For the 1st fraction, since 56 × 3 = 168,
    18/56 = 18 × 3/56 × 3 = 54/168
  3. Likewise, for the 2nd fraction, since 42 × 4 = 168,
    18/42 = 18 × 4/42 × 4 = 72/168
  4. Subtract the two fractions:
    54/168 - 72/168 = 54 - 72/168 = -18/168
  5. After reducing the fraction, the answer is -3/28

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