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Add 21/54 and 7/8

21/54 + 7/8 is 91/72.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 8 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 8 × 27 = 216,
    7/8 = 7 × 27/8 × 27 = 189/216
  4. Add the two like fractions:
    84/216 + 189/216 = 84 + 189/216 = 273/216
  5. 273/216 simplified gives 91/72
  6. So, 21/54 + 7/8 = 91/72
    In mixed form: 119/72

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