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Add 54/15 and 12/20

1st number: 3 9/15, 2nd number: 12/20

54/15 + 12/20 is 21/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 20 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 15 × 4 = 60,
    54/15 = 54 × 4/15 × 4 = 216/60
  3. Likewise, for the 2nd fraction, since 20 × 3 = 60,
    12/20 = 12 × 3/20 × 3 = 36/60
  4. Add the two like fractions:
    216/60 + 36/60 = 216 + 36/60 = 252/60
  5. 252/60 simplified gives 21/5
  6. So, 54/15 + 12/20 = 21/5
    In mixed form: 41/5

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