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Add 72/20 and 7/28

1st number: 3 12/20, 2nd number: 7/28

72/20 + 7/28 is 77/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 28 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 20 × 7 = 140,
    72/20 = 72 × 7/20 × 7 = 504/140
  3. Likewise, for the 2nd fraction, since 28 × 5 = 140,
    7/28 = 7 × 5/28 × 5 = 35/140
  4. Add the two like fractions:
    504/140 + 35/140 = 504 + 35/140 = 539/140
  5. 539/140 simplified gives 77/20
  6. So, 72/20 + 7/28 = 77/20
    In mixed form: 317/20

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