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Subtract 30/8 from 4/42

1st number: 4/42, 2nd number: 3 6/8

4/42 - 30/8 is -307/84.

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,
    4/42 = 4 × 4/42 × 4 = 16/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    30/8 = 30 × 21/8 × 21 = 630/168
  4. Subtract the two fractions:
    16/168 - 630/168 = 16 - 630/168 = -614/168
  5. After reducing the fraction, the answer is -307/84

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