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Add 12/21 and 21/63

12/21 + 21/63 is 19/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 63 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    12/21 = 12 × 3/21 × 3 = 36/63
  3. Likewise, for the 2nd fraction, since 63 × 1 = 63,
    21/63 = 21 × 1/63 × 1 = 21/63
  4. Add the two like fractions:
    36/63 + 21/63 = 36 + 21/63 = 57/63
  5. 57/63 simplified gives 19/21
  6. So, 12/21 + 21/63 = 19/21

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