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Subtract 12/20 from 28/70

28/70 - 12/20 is -1/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 20 is 140
  2. For the 1st fraction, since 70 × 2 = 140,
    28/70 = 28 × 2/70 × 2 = 56/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    12/20 = 12 × 7/20 × 7 = 84/140
  4. Subtract the two fractions:
    56/140 - 84/140 = 56 - 84/140 = -28/140
  5. After reducing the fraction, the answer is -1/5

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