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Add 15/28 and 1/21

15/28 + 1/21 is 7/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 21 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 28 × 3 = 84,
    15/28 = 15 × 3/28 × 3 = 45/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    1/21 = 1 × 4/21 × 4 = 4/84
  4. Add the two like fractions:
    45/84 + 4/84 = 45 + 4/84 = 49/84
  5. 49/84 simplified gives 7/12
  6. So, 15/28 + 1/21 = 7/12

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