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Subtract 3/21 from 21/36

21/36 - 3/21 is 37/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 21 is 252

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 36 × 7 = 252,
    21/36 = 21 × 7/36 × 7 = 147/252
  3. Likewise, for the 2nd fraction, since 21 × 12 = 252,
    3/21 = 3 × 12/21 × 12 = 36/252
  4. Subtract the two like fractions:
    147/252 - 36/252 = 147 - 36/252 = 111/252
  5. After reducing the fraction, the answer is 37/84

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