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Add 21/30 and 25/42

21/30 + 25/42 is 136/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 42 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 30 × 7 = 210,
    21/30 = 21 × 7/30 × 7 = 147/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    25/42 = 25 × 5/42 × 5 = 125/210
  4. Add the two like fractions:
    147/210 + 125/210 = 147 + 125/210 = 272/210
  5. 272/210 simplified gives 136/105
  6. So, 21/30 + 25/42 = 136/105
    In mixed form: 131/105

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