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Subtract 15/8 from 7/20

1st number: 7/20, 2nd number: 1 7/8

7/20 - 15/8 is -61/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 8 is 40

    Next, find the equivalent fraction of both fractional numbers with denominator 40
  2. For the 1st fraction, since 20 × 2 = 40,
    7/20 = 7 × 2/20 × 2 = 14/40
  3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
    15/8 = 15 × 5/8 × 5 = 75/40
  4. Subtract the two like fractions:
    14/40 - 75/40 = 14 - 75/40 = -61/40

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