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Subtract 21/9 from 45/80

1st number: 45/80, 2nd number: 2 3/9

45/80 - 21/9 is -85/48.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 9 is 720
  2. For the 1st fraction, since 80 × 9 = 720,
    45/80 = 45 × 9/80 × 9 = 405/720
  3. Likewise, for the 2nd fraction, since 9 × 80 = 720,
    21/9 = 21 × 80/9 × 80 = 1680/720
  4. Subtract the two fractions:
    405/720 - 1680/720 = 405 - 1680/720 = -1275/720
  5. After reducing the fraction, the answer is -85/48

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