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Subtract 9/40 from 90/12

1st number: 7 6/12, 2nd number: 9/40

90/12 - 9/40 is 291/40.

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,
    90/12 = 90 × 10/12 × 10 = 900/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    9/40 = 9 × 3/40 × 3 = 27/120
  4. Subtract the two fractions:
    900/120 - 27/120 = 900 - 27/120 = 873/120
  5. After reducing the fraction, the answer is 291/40
  6. In mixed form: 711/40

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