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Add 21/35 and 21/80

21/35 + 21/80 is 69/80.

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,
    21/80 = 21 × 7/80 × 7 = 147/560
  4. Add the two like fractions:
    336/560 + 147/560 = 336 + 147/560 = 483/560
  5. 483/560 simplified gives 69/80
  6. So, 21/35 + 21/80 = 69/80

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