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Subtract 21/18 from 45/80

1st number: 45/80, 2nd number: 1 3/18

45/80 - 21/18 is -29/48.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 18 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 18 × 40 = 720,
    21/18 = 21 × 40/18 × 40 = 840/720
  4. Subtract the two fractions:
    405/720 - 840/720 = 405 - 840/720 = -435/720
  5. After reducing the fraction, the answer is -29/48

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