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Subtract 12/20 from 3/70

3/70 - 12/20 is -39/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 20 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 70 × 2 = 140,
    3/70 = 3 × 2/70 × 2 = 6/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    12/20 = 12 × 7/20 × 7 = 84/140
  4. Subtract the two like fractions:
    6/140 - 84/140 = 6 - 84/140 = -78/140
  5. After reducing the fraction, the answer is -39/70

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