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Add 21/30 and 63/80

21/30 + 63/80 is 119/80.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 80 is 240

    Next, find the equivalent fraction of both fractional numbers with denominator 240
  2. For the 1st fraction, since 30 × 8 = 240,
    21/30 = 21 × 8/30 × 8 = 168/240
  3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
    63/80 = 63 × 3/80 × 3 = 189/240
  4. Add the two like fractions:
    168/240 + 189/240 = 168 + 189/240 = 357/240
  5. 357/240 simplified gives 119/80
  6. So, 21/30 + 63/80 = 119/80
    In mixed form: 139/80

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