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Subtract 12/40 from 7/70

7/70 - 12/40 is -1/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 40 is 280
  2. For the 1st fraction, since 70 × 4 = 280,
    7/70 = 7 × 4/70 × 4 = 28/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    12/40 = 12 × 7/40 × 7 = 84/280
  4. Subtract the two fractions:
    28/280 - 84/280 = 28 - 84/280 = -56/280
  5. After reducing the fraction, the answer is -1/5

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