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Subtract 21/90 from 12/75

12/75 - 21/90 is -11/150.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 75 and 90 is 450
  2. For the 1st fraction, since 75 × 6 = 450,
    12/75 = 12 × 6/75 × 6 = 72/450
  3. Likewise, for the 2nd fraction, since 90 × 5 = 450,
    21/90 = 21 × 5/90 × 5 = 105/450
  4. Subtract the two fractions:
    72/450 - 105/450 = 72 - 105/450 = -33/450
  5. After reducing the fraction, the answer is -11/150

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