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Add 45/12 and 72/15

1st number: 3 9/12, 2nd number: 4 12/15

45/12 + 72/15 is 171/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 15 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 12 × 5 = 60,
    45/12 = 45 × 5/12 × 5 = 225/60
  3. Likewise, for the 2nd fraction, since 15 × 4 = 60,
    72/15 = 72 × 4/15 × 4 = 288/60
  4. Add the two like fractions:
    225/60 + 288/60 = 225 + 288/60 = 513/60
  5. 513/60 simplified gives 171/20
  6. So, 45/12 + 72/15 = 171/20
    In mixed form: 811/20

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