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Subtract 8/5 from 5/21

1st number: 5/21, 2nd number: 1 3/5

5/21 - 8/5 is -143/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    5/21 = 5 × 5/21 × 5 = 25/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    8/5 = 8 × 21/5 × 21 = 168/105
  4. Subtract the two fractions:
    25/105 - 168/105 = 25 - 168/105 = -143/105

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