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Subtract 9/20 from 3/72

3/72 - 9/20 is -49/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 20 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 72 × 5 = 360,
    3/72 = 3 × 5/72 × 5 = 15/360
  3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
    9/20 = 9 × 18/20 × 18 = 162/360
  4. Subtract the two like fractions:
    15/360 - 162/360 = 15 - 162/360 = -147/360
  5. After reducing the fraction, the answer is -49/120

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