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Add 21/56 and 54/70

21/56 + 54/70 is 321/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 70 is 280
  2. For the 1st fraction, since 56 × 5 = 280,
    21/56 = 21 × 5/56 × 5 = 105/280
  3. Likewise, for the 2nd fraction, since 70 × 4 = 280,
    54/70 = 54 × 4/70 × 4 = 216/280
  4. Add the two fractions:
    105/280 + 216/280 = 105 + 216/280 = 321/280
  5. In mixed form: 141/280

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