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Subtract 21/8 from 3/7

1st number: 3/7, 2nd number: 2 5/8

3/7 - 21/8 is -123/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 8 is 56

    Next, find the equivalent fraction of both fractional numbers with denominator 56
  2. For the 1st fraction, since 7 × 8 = 56,
    3/7 = 3 × 8/7 × 8 = 24/56
  3. Likewise, for the 2nd fraction, since 8 × 7 = 56,
    21/8 = 21 × 7/8 × 7 = 147/56
  4. Subtract the two like fractions:
    24/56 - 147/56 = 24 - 147/56 = -123/56

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