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Add 7/12 and 18/21

7/12 + 18/21 is 121/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 21 is 84
  2. For the 1st fraction, since 12 × 7 = 84,
    7/12 = 7 × 7/12 × 7 = 49/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    18/21 = 18 × 4/21 × 4 = 72/84
  4. Add the two fractions:
    49/84 + 72/84 = 49 + 72/84 = 121/84
  5. So, 7/12 + 18/21 = 121/84
    In mixed form: 137/84

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