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Subtract 9/8 from 42/84

1st number: 42/84, 2nd number: 1 1/8

42/84 - 9/8 is -5/8.

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,
    42/84 = 42 × 2/84 × 2 = 84/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    9/8 = 9 × 21/8 × 21 = 189/168
  4. Subtract the two fractions:
    84/168 - 189/168 = 84 - 189/168 = -105/168
  5. After reducing the fraction, the answer is -5/8

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