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Add 21/60 and 49/80

21/60 + 49/80 is 77/80.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 60 and 80 is 240

    Next, find the equivalent fraction of both fractional numbers with denominator 240
  2. For the 1st fraction, since 60 × 4 = 240,
    21/60 = 21 × 4/60 × 4 = 84/240
  3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
    49/80 = 49 × 3/80 × 3 = 147/240
  4. Add the two like fractions:
    84/240 + 147/240 = 84 + 147/240 = 231/240
  5. 231/240 simplified gives 77/80
  6. So, 21/60 + 49/80 = 77/80

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