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Subtract 21/12 from 7/30

1st number: 7/30, 2nd number: 1 9/12

7/30 - 21/12 is -91/60.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 12 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 30 × 2 = 60,
    7/30 = 7 × 2/30 × 2 = 14/60
  3. Likewise, for the 2nd fraction, since 12 × 5 = 60,
    21/12 = 21 × 5/12 × 5 = 105/60
  4. Subtract the two like fractions:
    14/60 - 105/60 = 14 - 105/60 = -91/60

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