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Subtract 1/20 from 21/12

1st number: 1 9/12, 2nd number: 1/20

21/12 - 1/20 is 17/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 20 is 60
  2. For the 1st fraction, since 12 × 5 = 60,
    21/12 = 21 × 5/12 × 5 = 105/60
  3. Likewise, for the 2nd fraction, since 20 × 3 = 60,
    1/20 = 1 × 3/20 × 3 = 3/60
  4. Subtract the two fractions:
    105/60 - 3/60 = 105 - 3/60 = 102/60
  5. After reducing the fraction, the answer is 17/10
  6. In mixed form: 17/10

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