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Subtract 3/90 from 8/21

8/21 - 3/90 is 73/210.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 21 × 30 = 630,
    8/21 = 8 × 30/21 × 30 = 240/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    3/90 = 3 × 7/90 × 7 = 21/630
  4. Subtract the two like fractions:
    240/630 - 21/630 = 240 - 21/630 = 219/630
  5. After reducing the fraction, the answer is 73/210

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