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Subtract 1/20 from 21/30

21/30 - 1/20 is 13/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 20 is 60
  2. For the 1st fraction, since 30 × 2 = 60,
    21/30 = 21 × 2/30 × 2 = 42/60
  3. Likewise, for the 2nd fraction, since 20 × 3 = 60,
    1/20 = 1 × 3/20 × 3 = 3/60
  4. Subtract the two fractions:
    42/60 - 3/60 = 42 - 3/60 = 39/60
  5. After reducing the fraction, the answer is 13/20

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