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Add 21/35 and 42/70

21/35 + 42/70 is 6/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 70 is 70

    Next, find the equivalent fraction of both fractional numbers with denominator 70
  2. For the 1st fraction, since 35 × 2 = 70,
    21/35 = 21 × 2/35 × 2 = 42/70
  3. Likewise, for the 2nd fraction, since 70 × 1 = 70,
    42/70 = 42 × 1/70 × 1 = 42/70
  4. Add the two like fractions:
    42/70 + 42/70 = 42 + 42/70 = 84/70
  5. 84/70 simplified gives 6/5
  6. So, 21/35 + 42/70 = 6/5
    In mixed form: 11/5

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