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Add 15/28 and 21/30

15/28 + 21/30 is 173/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 30 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 28 × 15 = 420,
    15/28 = 15 × 15/28 × 15 = 225/420
  3. Likewise, for the 2nd fraction, since 30 × 14 = 420,
    21/30 = 21 × 14/30 × 14 = 294/420
  4. Add the two like fractions:
    225/420 + 294/420 = 225 + 294/420 = 519/420
  5. 519/420 simplified gives 173/140
  6. So, 15/28 + 21/30 = 173/140
    In mixed form: 133/140

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