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Subtract 20/72 from 1/5

1/5 - 20/72 is -7/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 72 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 5 × 72 = 360,
    1/5 = 1 × 72/5 × 72 = 72/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    20/72 = 20 × 5/72 × 5 = 100/360
  4. Subtract the two like fractions:
    72/360 - 100/360 = 72 - 100/360 = -28/360
  5. After reducing the fraction, the answer is -7/90

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