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Subtract 4/21 from 25/8

1st number: 3 1/8, 2nd number: 4/21

25/8 - 4/21 is 493/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 21 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 8 × 21 = 168,
    25/8 = 25 × 21/8 × 21 = 525/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    4/21 = 4 × 8/21 × 8 = 32/168
  4. Subtract the two like fractions:
    525/168 - 32/168 = 525 - 32/168 = 493/168
  5. In mixed form: 2157/168

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