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Subtract 84/40 from 84/42

1st number: 2 0/42, 2nd number: 2 4/40

84/42 - 84/40 is -1/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840
  2. For the 1st fraction, since 42 × 20 = 840,
    84/42 = 84 × 20/42 × 20 = 1680/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    84/40 = 84 × 21/40 × 21 = 1764/840
  4. Subtract the two fractions:
    1680/840 - 1764/840 = 1680 - 1764/840 = -84/840
  5. After reducing the fraction, the answer is -1/10

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