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Add 21/70 and 15/56

21/70 + 15/56 is 159/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 56 is 280
  2. For the 1st fraction, since 70 × 4 = 280,
    21/70 = 21 × 4/70 × 4 = 84/280
  3. Likewise, for the 2nd fraction, since 56 × 5 = 280,
    15/56 = 15 × 5/56 × 5 = 75/280
  4. Add the two fractions:
    84/280 + 75/280 = 84 + 75/280 = 159/280

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