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Subtract 30/84 from 1/90

1/90 - 30/84 is -109/315.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 84 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 90 × 14 = 1260,
    1/90 = 1 × 14/90 × 14 = 14/1260
  3. Likewise, for the 2nd fraction, since 84 × 15 = 1260,
    30/84 = 30 × 15/84 × 15 = 450/1260
  4. Subtract the two like fractions:
    14/1260 - 450/1260 = 14 - 450/1260 = -436/1260
  5. After reducing the fraction, the answer is -109/315

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