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Add 28/35 and 21/54

28/35 + 21/54 is 107/90.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 54 is 1890

    Next, find the equivalent fraction of both fractional numbers with denominator 1890
  2. For the 1st fraction, since 35 × 54 = 1890,
    28/35 = 28 × 54/35 × 54 = 1512/1890
  3. Likewise, for the 2nd fraction, since 54 × 35 = 1890,
    21/54 = 21 × 35/54 × 35 = 735/1890
  4. Add the two like fractions:
    1512/1890 + 735/1890 = 1512 + 735/1890 = 2247/1890
  5. 2247/1890 simplified gives 107/90
  6. So, 28/35 + 21/54 = 107/90
    In mixed form: 117/90

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