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Subtract 81/40 from 30/84

1st number: 30/84, 2nd number: 2 1/40

30/84 - 81/40 is -467/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840
  2. For the 1st fraction, since 84 × 10 = 840,
    30/84 = 30 × 10/84 × 10 = 300/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    81/40 = 81 × 21/40 × 21 = 1701/840
  4. Subtract the two fractions:
    300/840 - 1701/840 = 300 - 1701/840 = -1401/840
  5. After reducing the fraction, the answer is -467/280

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