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Subtract 18/20 from 49/70

49/70 - 18/20 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

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 70 × 2 = 140,
    49/70 = 49 × 2/70 × 2 = 98/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    18/20 = 18 × 7/20 × 7 = 126/140
  4. Subtract the two like fractions:
    98/140 - 126/140 = 98 - 126/140 = -28/140
  5. After reducing the fraction, the answer is -1/5

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