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Subtract 8/10 from 7/20

7/20 - 8/10 is -9/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 10 is 20
  2. For the 1st fraction, since 20 × 1 = 20,
    7/20 = 7 × 1/20 × 1 = 7/20
  3. Likewise, for the 2nd fraction, since 10 × 2 = 20,
    8/10 = 8 × 2/10 × 2 = 16/20
  4. Subtract the two fractions:
    7/20 - 16/20 = 7 - 16/20 = -9/20

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