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Subtract 49/50 from 21/90

21/90 - 49/50 is -56/75.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 50 is 450
  2. For the 1st fraction, since 90 × 5 = 450,
    21/90 = 21 × 5/90 × 5 = 105/450
  3. Likewise, for the 2nd fraction, since 50 × 9 = 450,
    49/50 = 49 × 9/50 × 9 = 441/450
  4. Subtract the two fractions:
    105/450 - 441/450 = 105 - 441/450 = -336/450
  5. After reducing the fraction, the answer is -56/75

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