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Subtract 1/20 from 21/90

21/90 - 1/20 is 11/60.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 20 is 180
  2. For the 1st fraction, since 90 × 2 = 180,
    21/90 = 21 × 2/90 × 2 = 42/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    1/20 = 1 × 9/20 × 9 = 9/180
  4. Subtract the two fractions:
    42/180 - 9/180 = 42 - 9/180 = 33/180
  5. After reducing the fraction, the answer is 11/60

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