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Subtract 2/9 from 2/21

2/21 - 2/9 is -8/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    2/21 = 2 × 3/21 × 3 = 6/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    2/9 = 2 × 7/9 × 7 = 14/63
  4. Subtract the two fractions:
    6/63 - 14/63 = 6 - 14/63 = -8/63

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