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Subtract 18/40 from 5/70

5/70 - 18/40 is -53/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 40 is 280

    Next, find the equivalent fraction of both fractional numbers with denominator 280
  2. For the 1st fraction, since 70 × 4 = 280,
    5/70 = 5 × 4/70 × 4 = 20/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    18/40 = 18 × 7/40 × 7 = 126/280
  4. Subtract the two like fractions:
    20/280 - 126/280 = 20 - 126/280 = -106/280
  5. After reducing the fraction, the answer is -53/140

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