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Subtract 84/63 from 8/90

1st number: 8/90, 2nd number: 1 21/63

8/90 - 84/63 is -56/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 63 is 630
  2. For the 1st fraction, since 90 × 7 = 630,
    8/90 = 8 × 7/90 × 7 = 56/630
  3. Likewise, for the 2nd fraction, since 63 × 10 = 630,
    84/63 = 84 × 10/63 × 10 = 840/630
  4. Subtract the two fractions:
    56/630 - 840/630 = 56 - 840/630 = -784/630
  5. After reducing the fraction, the answer is -56/45

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