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Subtract 21/30 from 4/9

4/9 - 21/30 is -23/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 30 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 9 × 10 = 90,
    4/9 = 4 × 10/9 × 10 = 40/90
  3. Likewise, for the 2nd fraction, since 30 × 3 = 90,
    21/30 = 21 × 3/30 × 3 = 63/90
  4. Subtract the two like fractions:
    40/90 - 63/90 = 40 - 63/90 = -23/90

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