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Subtract 21/30 from 28/18

1st number: 1 10/18, 2nd number: 21/30

28/18 - 21/30 is 77/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 30 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 18 × 5 = 90,
    28/18 = 28 × 5/18 × 5 = 140/90
  3. Likewise, for the 2nd fraction, since 30 × 3 = 90,
    21/30 = 21 × 3/30 × 3 = 63/90
  4. Subtract the two like fractions:
    140/90 - 63/90 = 140 - 63/90 = 77/90

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