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Subtract 20/72 from 1/30

1/30 - 20/72 is -11/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 72 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 30 × 12 = 360,
    1/30 = 1 × 12/30 × 12 = 12/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    20/72 = 20 × 5/72 × 5 = 100/360
  4. Subtract the two like fractions:
    12/360 - 100/360 = 12 - 100/360 = -88/360
  5. After reducing the fraction, the answer is -11/45

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