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Add 21/28 and 4/63

21/28 + 4/63 is 205/252.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 63 is 252
  2. For the 1st fraction, since 28 × 9 = 252,
    21/28 = 21 × 9/28 × 9 = 189/252
  3. Likewise, for the 2nd fraction, since 63 × 4 = 252,
    4/63 = 4 × 4/63 × 4 = 16/252
  4. Add the two fractions:
    189/252 + 16/252 = 189 + 16/252 = 205/252

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