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Add 21/54 and 49/72

21/54 + 49/72 is 77/72.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 72 is 216

    Next, find the equivalent fraction of both fractional numbers with denominator 216
  2. For the 1st fraction, since 54 × 4 = 216,
    21/54 = 21 × 4/54 × 4 = 84/216
  3. Likewise, for the 2nd fraction, since 72 × 3 = 216,
    49/72 = 49 × 3/72 × 3 = 147/216
  4. Add the two like fractions:
    84/216 + 147/216 = 84 + 147/216 = 231/216
  5. 231/216 simplified gives 77/72
  6. So, 21/54 + 49/72 = 77/72
    In mixed form: 15/72

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