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Subtract 72/20 from 8/5

1st number: 1 3/5, 2nd number: 3 12/20

8/5 - 72/20 is -2/1.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 20 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 5 × 4 = 20,
    8/5 = 8 × 4/5 × 4 = 32/20
  3. Likewise, for the 2nd fraction, since 20 × 1 = 20,
    72/20 = 72 × 1/20 × 1 = 72/20
  4. Subtract the two like fractions:
    32/20 - 72/20 = 32 - 72/20 = -40/20
  5. After reducing the fraction, the answer is -2/1

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