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Subtract 21/54 from 1/5

1/5 - 21/54 is -17/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 54 is 270

    Next, find the equivalent fraction of both fractional numbers with denominator 270
  2. For the 1st fraction, since 5 × 54 = 270,
    1/5 = 1 × 54/5 × 54 = 54/270
  3. Likewise, for the 2nd fraction, since 54 × 5 = 270,
    21/54 = 21 × 5/54 × 5 = 105/270
  4. Subtract the two like fractions:
    54/270 - 105/270 = 54 - 105/270 = -51/270
  5. After reducing the fraction, the answer is -17/90

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