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Subtract 30/72 from 30/90

30/90 - 30/72 is -1/12.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 72 is 360
  2. For the 1st fraction, since 90 × 4 = 360,
    30/90 = 30 × 4/90 × 4 = 120/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    30/72 = 30 × 5/72 × 5 = 150/360
  4. Subtract the two fractions:
    120/360 - 150/360 = 120 - 150/360 = -30/360
  5. After reducing the fraction, the answer is -1/12

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