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Add 28/70 and 1/21

28/70 + 1/21 is 47/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 21 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 70 × 3 = 210,
    28/70 = 28 × 3/70 × 3 = 84/210
  3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
    1/21 = 1 × 10/21 × 10 = 10/210
  4. Add the two like fractions:
    84/210 + 10/210 = 84 + 10/210 = 94/210
  5. 94/210 simplified gives 47/105
  6. So, 28/70 + 1/21 = 47/105

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