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Subtract 21/80 from 28/9

1st number: 3 1/9, 2nd number: 21/80

28/9 - 21/80 is 2051/720.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 80 is 720
  2. For the 1st fraction, since 9 × 80 = 720,
    28/9 = 28 × 80/9 × 80 = 2240/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    21/80 = 21 × 9/80 × 9 = 189/720
  4. Subtract the two fractions:
    2240/720 - 189/720 = 2240 - 189/720 = 2051/720
  5. In mixed form: 2611/720

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