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Add 72/20 and 90/28

1st number: 3 12/20, 2nd number: 3 6/28

72/20 + 90/28 is 477/70.

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,
    90/28 = 90 × 5/28 × 5 = 450/140
  4. Add the two like fractions:
    504/140 + 450/140 = 504 + 450/140 = 954/140
  5. 954/140 simplified gives 477/70
  6. So, 72/20 + 90/28 = 477/70
    In mixed form: 657/70

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