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Subtract 72/20 from 42/2

1st number: 21 0/2, 2nd number: 3 12/20

42/2 - 72/20 is 87/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 2 and 20 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 2 × 10 = 20,
    42/2 = 42 × 10/2 × 10 = 420/20
  3. Likewise, for the 2nd fraction, since 20 × 1 = 20,
    72/20 = 72 × 1/20 × 1 = 72/20
  4. Subtract the two like fractions:
    420/20 - 72/20 = 420 - 72/20 = 348/20
  5. After reducing the fraction, the answer is 87/5
  6. In mixed form: 172/5

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