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Subtract 21/7 from 5/28

1st number: 5/28, 2nd number: 3 0/7

5/28 - 21/7 is -79/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 7 is 28

    Next, find the equivalent fraction of both fractional numbers with denominator 28
  2. For the 1st fraction, since 28 × 1 = 28,
    5/28 = 5 × 1/28 × 1 = 5/28
  3. Likewise, for the 2nd fraction, since 7 × 4 = 28,
    21/7 = 21 × 4/7 × 4 = 84/28
  4. Subtract the two like fractions:
    5/28 - 84/28 = 5 - 84/28 = -79/28

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