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Subtract 28/35 from 1/90

1/90 - 28/35 is -71/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 35 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    1/90 = 1 × 7/90 × 7 = 7/630
  3. Likewise, for the 2nd fraction, since 35 × 18 = 630,
    28/35 = 28 × 18/35 × 18 = 504/630
  4. Subtract the two like fractions:
    7/630 - 504/630 = 7 - 504/630 = -497/630
  5. After reducing the fraction, the answer is -71/90

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