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Add 72/20 and 21/90

1st number: 3 12/20, 2nd number: 21/90

72/20 + 21/90 is 23/6.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 90 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 20 × 9 = 180,
    72/20 = 72 × 9/20 × 9 = 648/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    21/90 = 21 × 2/90 × 2 = 42/180
  4. Add the two like fractions:
    648/180 + 42/180 = 648 + 42/180 = 690/180
  5. 690/180 simplified gives 23/6
  6. So, 72/20 + 21/90 = 23/6
    In mixed form: 35/6

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