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Subtract 70/40 from 40/42

1st number: 40/42, 2nd number: 1 30/40

40/42 - 70/40 is -67/84.

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,
    40/42 = 40 × 20/42 × 20 = 800/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    70/40 = 70 × 21/40 × 21 = 1470/840
  4. Subtract the two fractions:
    800/840 - 1470/840 = 800 - 1470/840 = -670/840
  5. After reducing the fraction, the answer is -67/84

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