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Subtract 4/21 from 28/15

1st number: 1 13/15, 2nd number: 4/21

28/15 - 4/21 is 176/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 15 × 7 = 105,
    28/15 = 28 × 7/15 × 7 = 196/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    4/21 = 4 × 5/21 × 5 = 20/105
  4. Subtract the two like fractions:
    196/105 - 20/105 = 196 - 20/105 = 176/105
  5. In mixed form: 171/105

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