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Subtract 30/8 from 20/42

1st number: 20/42, 2nd number: 3 6/8

20/42 - 30/8 is -275/84.

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,
    20/42 = 20 × 4/42 × 4 = 80/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    30/8 = 30 × 21/8 × 21 = 630/168
  4. Subtract the two fractions:
    80/168 - 630/168 = 80 - 630/168 = -550/168
  5. After reducing the fraction, the answer is -275/84

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