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Subtract 20/40 from 7/15

7/15 - 20/40 is -1/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 40 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 15 × 8 = 120,
    7/15 = 7 × 8/15 × 8 = 56/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    20/40 = 20 × 3/40 × 3 = 60/120
  4. Subtract the two like fractions:
    56/120 - 60/120 = 56 - 60/120 = -4/120
  5. After reducing the fraction, the answer is -1/30

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