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Add 20/15 and 21/28

1st number: 1 5/15, 2nd number: 21/28

20/15 + 21/28 is 25/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 28 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 15 × 28 = 420,
    20/15 = 20 × 28/15 × 28 = 560/420
  3. Likewise, for the 2nd fraction, since 28 × 15 = 420,
    21/28 = 21 × 15/28 × 15 = 315/420
  4. Add the two like fractions:
    560/420 + 315/420 = 560 + 315/420 = 875/420
  5. 875/420 simplified gives 25/12
  6. So, 20/15 + 21/28 = 25/12
    In mixed form: 21/12

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