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Subtract 21/12 from 30/18

1st number: 1 12/18, 2nd number: 1 9/12

30/18 - 21/12 is -1/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 12 is 36
  2. For the 1st fraction, since 18 × 2 = 36,
    30/18 = 30 × 2/18 × 2 = 60/36
  3. Likewise, for the 2nd fraction, since 12 × 3 = 36,
    21/12 = 21 × 3/12 × 3 = 63/36
  4. Subtract the two fractions:
    60/36 - 63/36 = 60 - 63/36 = -3/36
  5. After reducing the fraction, the answer is -1/12

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