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Subtract 21/8 from 21/28

1st number: 21/28, 2nd number: 2 5/8

21/28 - 21/8 is -15/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 8 is 56
  2. For the 1st fraction, since 28 × 2 = 56,
    21/28 = 21 × 2/28 × 2 = 42/56
  3. Likewise, for the 2nd fraction, since 8 × 7 = 56,
    21/8 = 21 × 7/8 × 7 = 147/56
  4. Subtract the two fractions:
    42/56 - 147/56 = 42 - 147/56 = -105/56
  5. After reducing the fraction, the answer is -15/8

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