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Subtract 81/40 from 30/12

1st number: 2 6/12, 2nd number: 2 1/40

30/12 - 81/40 is 19/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 40 is 120
  2. For the 1st fraction, since 12 × 10 = 120,
    30/12 = 30 × 10/12 × 10 = 300/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    81/40 = 81 × 3/40 × 3 = 243/120
  4. Subtract the two fractions:
    300/120 - 243/120 = 300 - 243/120 = 57/120
  5. After reducing the fraction, the answer is 19/40

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