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Subtract 21/90 from 10/15

10/15 - 21/90 is 13/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 90 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 15 × 6 = 90,
    10/15 = 10 × 6/15 × 6 = 60/90
  3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
    21/90 = 21 × 1/90 × 1 = 21/90
  4. Subtract the two like fractions:
    60/90 - 21/90 = 60 - 21/90 = 39/90
  5. After reducing the fraction, the answer is 13/30

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