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Subtract 5/7 from 21/8

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

21/8 - 5/7 is 107/56.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 56
  2. For the 1st fraction, since 8 × 7 = 56,
    21/8 = 21 × 7/8 × 7 = 147/56
  3. Likewise, for the 2nd fraction, since 7 × 8 = 56,
    5/7 = 5 × 8/7 × 8 = 40/56
  4. Subtract the two like fractions:
    147/56 - 40/56 = 147 - 40/56 = 107/56
  5. In mixed form: 151/56

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