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Add 72/80 and 18/15

1st number: 72/80, 2nd number: 1 3/15

72/80 + 18/15 is 21/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 15 is 240

    Next, find the equivalent fraction of both fractional numbers with denominator 240
  2. For the 1st fraction, since 80 × 3 = 240,
    72/80 = 72 × 3/80 × 3 = 216/240
  3. Likewise, for the 2nd fraction, since 15 × 16 = 240,
    18/15 = 18 × 16/15 × 16 = 288/240
  4. Add the two like fractions:
    216/240 + 288/240 = 216 + 288/240 = 504/240
  5. 504/240 simplified gives 21/10
  6. So, 72/80 + 18/15 = 21/10
    In mixed form: 21/10

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