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Subtract 4/9 from 28/21

1st number: 1 7/21, 2nd number: 4/9

28/21 - 4/9 is 8/9.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    28/21 = 28 × 3/21 × 3 = 84/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    4/9 = 4 × 7/9 × 7 = 28/63
  4. Subtract the two like fractions:
    84/63 - 28/63 = 84 - 28/63 = 56/63
  5. After reducing the fraction, the answer is 8/9

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