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Add 21/30 and 81/8

1st number: 21/30, 2nd number: 10 1/8

21/30 + 81/8 is 433/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 8 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 30 × 4 = 120,
    21/30 = 21 × 4/30 × 4 = 84/120
  3. Likewise, for the 2nd fraction, since 8 × 15 = 120,
    81/8 = 81 × 15/8 × 15 = 1215/120
  4. Add the two like fractions:
    84/120 + 1215/120 = 84 + 1215/120 = 1299/120
  5. 1299/120 simplified gives 433/40
  6. So, 21/30 + 81/8 = 433/40
    In mixed form: 1033/40

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