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Subtract 1/40 from 21/54

21/54 - 1/40 is 131/360.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 40 is 1080

    Next, find the equivalent fraction of both fractional numbers with denominator 1080
  2. For the 1st fraction, since 54 × 20 = 1080,
    21/54 = 21 × 20/54 × 20 = 420/1080
  3. Likewise, for the 2nd fraction, since 40 × 27 = 1080,
    1/40 = 1 × 27/40 × 27 = 27/1080
  4. Subtract the two like fractions:
    420/1080 - 27/1080 = 420 - 27/1080 = 393/1080
  5. After reducing the fraction, the answer is 131/360

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