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Subtract 30/42 from 6/90

6/90 - 30/42 is -68/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 42 is 630
  2. For the 1st fraction, since 90 × 7 = 630,
    6/90 = 6 × 7/90 × 7 = 42/630
  3. Likewise, for the 2nd fraction, since 42 × 15 = 630,
    30/42 = 30 × 15/42 × 15 = 450/630
  4. Subtract the two fractions:
    42/630 - 450/630 = 42 - 450/630 = -408/630
  5. After reducing the fraction, the answer is -68/105

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