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Add 21/35 and 63/80

21/35 + 63/80 is 111/80.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 35 × 16 = 560,
    21/35 = 21 × 16/35 × 16 = 336/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    63/80 = 63 × 7/80 × 7 = 441/560
  4. Add the two like fractions:
    336/560 + 441/560 = 336 + 441/560 = 777/560
  5. 777/560 simplified gives 111/80
  6. So, 21/35 + 63/80 = 111/80
    In mixed form: 131/80

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