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Add 21/84 and 54/15

1st number: 21/84, 2nd number: 3 9/15

21/84 + 54/15 is 77/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 15 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 84 × 5 = 420,
    21/84 = 21 × 5/84 × 5 = 105/420
  3. Likewise, for the 2nd fraction, since 15 × 28 = 420,
    54/15 = 54 × 28/15 × 28 = 1512/420
  4. Add the two like fractions:
    105/420 + 1512/420 = 105 + 1512/420 = 1617/420
  5. 1617/420 simplified gives 77/20
  6. So, 21/84 + 54/15 = 77/20
    In mixed form: 317/20

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