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Add 15/21 and 4/63

15/21 + 4/63 is 7/9.

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,
    15/21 = 15 × 3/21 × 3 = 45/63
  3. Likewise, for the 2nd fraction, since 63 × 1 = 63,
    4/63 = 4 × 1/63 × 1 = 4/63
  4. Add the two like fractions:
    45/63 + 4/63 = 45 + 4/63 = 49/63
  5. 49/63 simplified gives 7/9
  6. So, 15/21 + 4/63 = 7/9

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