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Subtract 90/20 from 50/21

1st number: 2 8/21, 2nd number: 4 10/20

50/21 - 90/20 is -89/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420
  2. For the 1st fraction, since 21 × 20 = 420,
    50/21 = 50 × 20/21 × 20 = 1000/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    90/20 = 90 × 21/20 × 21 = 1890/420
  4. Subtract the two fractions:
    1000/420 - 1890/420 = 1000 - 1890/420 = -890/420
  5. After reducing the fraction, the answer is -89/42

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