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Add 15/21 and 28/32

15/21 + 28/32 is 89/56.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 32 is 672

    Next, find the equivalent fraction of both fractional numbers with denominator 672
  2. For the 1st fraction, since 21 × 32 = 672,
    15/21 = 15 × 32/21 × 32 = 480/672
  3. Likewise, for the 2nd fraction, since 32 × 21 = 672,
    28/32 = 28 × 21/32 × 21 = 588/672
  4. Add the two like fractions:
    480/672 + 588/672 = 480 + 588/672 = 1068/672
  5. 1068/672 simplified gives 89/56
  6. So, 15/21 + 28/32 = 89/56
    In mixed form: 133/56

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