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Subtract 28/90 from 10/21

10/21 - 28/90 is 52/315.

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,
    10/21 = 10 × 30/21 × 30 = 300/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    28/90 = 28 × 7/90 × 7 = 196/630
  4. Subtract the two like fractions:
    300/630 - 196/630 = 300 - 196/630 = 104/630
  5. After reducing the fraction, the answer is 52/315

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