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Subtract 81/40 from 30/36

1st number: 30/36, 2nd number: 2 1/40

30/36 - 81/40 is -143/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 40 is 360
  2. For the 1st fraction, since 36 × 10 = 360,
    30/36 = 30 × 10/36 × 10 = 300/360
  3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
    81/40 = 81 × 9/40 × 9 = 729/360
  4. Subtract the two fractions:
    300/360 - 729/360 = 300 - 729/360 = -429/360
  5. After reducing the fraction, the answer is -143/120

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