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Subtract 1/8 from 21/12

1st number: 1 9/12, 2nd number: 1/8

21/12 - 1/8 is 13/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 8 is 24
  2. For the 1st fraction, since 12 × 2 = 24,
    21/12 = 21 × 2/12 × 2 = 42/24
  3. Likewise, for the 2nd fraction, since 8 × 3 = 24,
    1/8 = 1 × 3/8 × 3 = 3/24
  4. Subtract the two fractions:
    42/24 - 3/24 = 42 - 3/24 = 39/24
  5. After reducing the fraction, the answer is 13/8
  6. In mixed form: 15/8

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