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Add 15/30 and 21/56

15/30 + 21/56 is 7/8.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 56 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 30 × 28 = 840,
    15/30 = 15 × 28/30 × 28 = 420/840
  3. Likewise, for the 2nd fraction, since 56 × 15 = 840,
    21/56 = 21 × 15/56 × 15 = 315/840
  4. Add the two like fractions:
    420/840 + 315/840 = 420 + 315/840 = 735/840
  5. 735/840 simplified gives 7/8
  6. So, 15/30 + 21/56 = 7/8

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