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Subtract 21/12 from 7/45

1st number: 7/45, 2nd number: 1 9/12

7/45 - 21/12 is -287/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 12 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 45 × 4 = 180,
    7/45 = 7 × 4/45 × 4 = 28/180
  3. Likewise, for the 2nd fraction, since 12 × 15 = 180,
    21/12 = 21 × 15/12 × 15 = 315/180
  4. Subtract the two like fractions:
    28/180 - 315/180 = 28 - 315/180 = -287/180

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