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Subtract 27/40 from 30/72

30/72 - 27/40 is -31/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 40 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 72 × 5 = 360,
    30/72 = 30 × 5/72 × 5 = 150/360
  3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
    27/40 = 27 × 9/40 × 9 = 243/360
  4. Subtract the two like fractions:
    150/360 - 243/360 = 150 - 243/360 = -93/360
  5. After reducing the fraction, the answer is -31/120

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