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Add 21/84 and 36/63

21/84 + 36/63 is 23/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 63 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 63 × 4 = 252,
    36/63 = 36 × 4/63 × 4 = 144/252
  4. Add the two fractions:
    63/252 + 144/252 = 63 + 144/252 = 207/252
  5. 207/252 simplified gives 23/28
  6. So, 21/84 + 36/63 = 23/28

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