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Subtract 9/7 from 2/21

1st number: 2/21, 2nd number: 1 2/7

2/21 - 9/7 is -25/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21
  2. For the 1st fraction, since 21 × 1 = 21,
    2/21 = 2 × 1/21 × 1 = 2/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    9/7 = 9 × 3/7 × 3 = 27/21
  4. Subtract the two fractions:
    2/21 - 27/21 = 2 - 27/21 = -25/21

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