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Subtract 1/20 from 21/54

21/54 - 1/20 is 61/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 20 is 540
  2. For the 1st fraction, since 54 × 10 = 540,
    21/54 = 21 × 10/54 × 10 = 210/540
  3. Likewise, for the 2nd fraction, since 20 × 27 = 540,
    1/20 = 1 × 27/20 × 27 = 27/540
  4. Subtract the two fractions:
    210/540 - 27/540 = 210 - 27/540 = 183/540
  5. After reducing the fraction, the answer is 61/180

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