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Subtract 9/8 from 5/42

1st number: 5/42, 2nd number: 1 1/8

5/42 - 9/8 is -169/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 8 is 168
  2. For the 1st fraction, since 42 × 4 = 168,
    5/42 = 5 × 4/42 × 4 = 20/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    9/8 = 9 × 21/8 × 21 = 189/168
  4. Subtract the two fractions:
    20/168 - 189/168 = 20 - 189/168 = -169/168

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