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Add 21/15 and 28/70

1st number: 1 6/15, 2nd number: 28/70

21/15 + 28/70 is 9/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 70 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 15 × 14 = 210,
    21/15 = 21 × 14/15 × 14 = 294/210
  3. Likewise, for the 2nd fraction, since 70 × 3 = 210,
    28/70 = 28 × 3/70 × 3 = 84/210
  4. Add the two like fractions:
    294/210 + 84/210 = 294 + 84/210 = 378/210
  5. 378/210 simplified gives 9/5
  6. So, 21/15 + 28/70 = 9/5
    In mixed form: 14/5

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