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Subtract 81/40 from 10/84

1st number: 10/84, 2nd number: 2 1/40

10/84 - 81/40 is -1601/840.

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,
    10/84 = 10 × 10/84 × 10 = 100/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    81/40 = 81 × 21/40 × 21 = 1701/840
  4. Subtract the two fractions:
    100/840 - 1701/840 = 100 - 1701/840 = -1601/840

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