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Add 21/15 and 28/72

1st number: 1 6/15, 2nd number: 28/72

21/15 + 28/72 is 161/90.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 72 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 15 × 24 = 360,
    21/15 = 21 × 24/15 × 24 = 504/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    28/72 = 28 × 5/72 × 5 = 140/360
  4. Add the two like fractions:
    504/360 + 140/360 = 504 + 140/360 = 644/360
  5. 644/360 simplified gives 161/90
  6. So, 21/15 + 28/72 = 161/90
    In mixed form: 171/90

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