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Add 21/84 and 4/9

21/84 + 4/9 is 25/36.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 9 is 252
  2. For the 1st fraction, since 84 × 3 = 252,
    21/84 = 21 × 3/84 × 3 = 63/252
  3. Likewise, for the 2nd fraction, since 9 × 28 = 252,
    4/9 = 4 × 28/9 × 28 = 112/252
  4. Add the two fractions:
    63/252 + 112/252 = 63 + 112/252 = 175/252
  5. After reducing the fraction, the answer is 25/36

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