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Subtract 21/9 from 15/18

1st number: 15/18, 2nd number: 2 3/9

15/18 - 21/9 is -3/2.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 9 is 18
  2. For the 1st fraction, since 18 × 1 = 18,
    15/18 = 15 × 1/18 × 1 = 15/18
  3. Likewise, for the 2nd fraction, since 9 × 2 = 18,
    21/9 = 21 × 2/9 × 2 = 42/18
  4. Subtract the two fractions:
    15/18 - 42/18 = 15 - 42/18 = -27/18
  5. After reducing the fraction, the answer is -3/2

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