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Add 21/10 and 12/21

1st number: 2 1/10, 2nd number: 12/21

21/10 + 12/21 is 187/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 21 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 10 × 21 = 210,
    21/10 = 21 × 21/10 × 21 = 441/210
  3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
    12/21 = 12 × 10/21 × 10 = 120/210
  4. Add the two like fractions:
    441/210 + 120/210 = 441 + 120/210 = 561/210
  5. 561/210 simplified gives 187/70
  6. So, 21/10 + 12/21 = 187/70
    In mixed form: 247/70

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