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Subtract 21/90 from 5/6

5/6 - 21/90 is 3/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 6 and 90 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 6 × 15 = 90,
    5/6 = 5 × 15/6 × 15 = 75/90
  3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
    21/90 = 21 × 1/90 × 1 = 21/90
  4. Subtract the two like fractions:
    75/90 - 21/90 = 75 - 21/90 = 54/90
  5. After reducing the fraction, the answer is 3/5

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