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Subtract 81/8 from 20/84

1st number: 20/84, 2nd number: 10 1/8

20/84 - 81/8 is -1661/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 8 is 168
  2. For the 1st fraction, since 84 × 2 = 168,
    20/84 = 20 × 2/84 × 2 = 40/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    81/8 = 81 × 21/8 × 21 = 1701/168
  4. Subtract the two fractions:
    40/168 - 1701/168 = 40 - 1701/168 = -1661/168

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