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Add 21/54 and 4/63

21/54 + 4/63 is 19/42.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 63 is 378

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 54 × 7 = 378,
    21/54 = 21 × 7/54 × 7 = 147/378
  3. Likewise, for the 2nd fraction, since 63 × 6 = 378,
    4/63 = 4 × 6/63 × 6 = 24/378
  4. Add the two like fractions:
    147/378 + 24/378 = 147 + 24/378 = 171/378
  5. 171/378 simplified gives 19/42
  6. So, 21/54 + 4/63 = 19/42

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