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Subtract 5/21 from 7/90

7/90 - 5/21 is -101/630.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 21 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    7/90 = 7 × 7/90 × 7 = 49/630
  3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
    5/21 = 5 × 30/21 × 30 = 150/630
  4. Subtract the two like fractions:
    49/630 - 150/630 = 49 - 150/630 = -101/630

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