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Subtract 4/5 from 21/12

1st number: 1 9/12, 2nd number: 4/5

21/12 - 4/5 is 19/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 5 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 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 5 × 12 = 60,
    4/5 = 4 × 12/5 × 12 = 48/60
  4. Subtract the two like fractions:
    105/60 - 48/60 = 105 - 48/60 = 57/60
  5. After reducing the fraction, the answer is 19/20

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