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Add 21/80 and 15/35

21/80 + 15/35 is 387/560.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 35 is 560

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 80 × 7 = 560,
    21/80 = 21 × 7/80 × 7 = 147/560
  3. Likewise, for the 2nd fraction, since 35 × 16 = 560,
    15/35 = 15 × 16/35 × 16 = 240/560
  4. Add the two like fractions:
    147/560 + 240/560 = 147 + 240/560 = 387/560
  5. So, 21/80 + 15/35 = 387/560

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