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Subtract 15/4 from 8/21

1st number: 8/21, 2nd number: 3 3/4

8/21 - 15/4 is -283/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 4 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    8/21 = 8 × 4/21 × 4 = 32/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    15/4 = 15 × 21/4 × 21 = 315/84
  4. Subtract the two fractions:
    32/84 - 315/84 = 32 - 315/84 = -283/84

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