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Add 21/84 and 18/15

1st number: 21/84, 2nd number: 1 3/15

21/84 + 18/15 is 29/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 15 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 15 × 28 = 420,
    18/15 = 18 × 28/15 × 28 = 504/420
  4. Add the two fractions:
    105/420 + 504/420 = 105 + 504/420 = 609/420
  5. After reducing the fraction, the answer is 29/20
  6. In mixed form: 19/20

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