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Subtract 21/8 from 3/20

1st number: 3/20, 2nd number: 2 5/8

3/20 - 21/8 is -99/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 8 is 40
  2. For the 1st fraction, since 20 × 2 = 40,
    3/20 = 3 × 2/20 × 2 = 6/40
  3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
    21/8 = 21 × 5/8 × 5 = 105/40
  4. Subtract the two fractions:
    6/40 - 105/40 = 6 - 105/40 = -99/40

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