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Subtract 90/63 from 21/90

1st number: 21/90, 2nd number: 1 27/63

21/90 - 90/63 is -251/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 63 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  3. Likewise, for the 2nd fraction, since 63 × 10 = 630,
    90/63 = 90 × 10/63 × 10 = 900/630
  4. Subtract the two like fractions:
    147/630 - 900/630 = 147 - 900/630 = -753/630
  5. After reducing the fraction, the answer is -251/210

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