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Subtract 98/80 from 21/45

1st number: 21/45, 2nd number: 1 18/80

21/45 - 98/80 is -91/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 80 is 720
  2. For the 1st fraction, since 45 × 16 = 720,
    21/45 = 21 × 16/45 × 16 = 336/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    98/80 = 98 × 9/80 × 9 = 882/720
  4. Subtract the two fractions:
    336/720 - 882/720 = 336 - 882/720 = -546/720
  5. After reducing the fraction, the answer is -91/120

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