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Subtract 28/90 from 5/7

5/7 - 28/90 is 127/315.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 7 × 90 = 630,
    5/7 = 5 × 90/7 × 90 = 450/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    28/90 = 28 × 7/90 × 7 = 196/630
  4. Subtract the two like fractions:
    450/630 - 196/630 = 450 - 196/630 = 254/630
  5. After reducing the fraction, the answer is 127/315

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