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Subtract 8/90 from 1/21

1/21 - 8/90 is -13/315.

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,
    1/21 = 1 × 30/21 × 30 = 30/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    8/90 = 8 × 7/90 × 7 = 56/630
  4. Subtract the two like fractions:
    30/630 - 56/630 = 30 - 56/630 = -26/630
  5. After reducing the fraction, the answer is -13/315

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