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Subtract 5/9 from 7/21

7/21 - 5/9 is -2/9.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    7/21 = 7 × 3/21 × 3 = 21/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    5/9 = 5 × 7/9 × 7 = 35/63
  4. Subtract the two like fractions:
    21/63 - 35/63 = 21 - 35/63 = -14/63
  5. After reducing the fraction, the answer is -2/9

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