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Add 21/84 and 9/30

21/84 + 9/30 is 11/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 30 is 420
  2. For the 1st fraction, since 84 × 5 = 420,
    21/84 = 21 × 5/84 × 5 = 105/420
  3. Likewise, for the 2nd fraction, since 30 × 14 = 420,
    9/30 = 9 × 14/30 × 14 = 126/420
  4. Add the two fractions:
    105/420 + 126/420 = 105 + 126/420 = 231/420
  5. After reducing the fraction, the answer is 11/20

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