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Add 70/84 and 21/54

70/84 + 21/54 is 11/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 54 is 756

    Next, find the equivalent fraction of both fractional numbers with denominator 756
  2. For the 1st fraction, since 84 × 9 = 756,
    70/84 = 70 × 9/84 × 9 = 630/756
  3. Likewise, for the 2nd fraction, since 54 × 14 = 756,
    21/54 = 21 × 14/54 × 14 = 294/756
  4. Add the two like fractions:
    630/756 + 294/756 = 630 + 294/756 = 924/756
  5. 924/756 simplified gives 11/9
  6. So, 70/84 + 21/54 = 11/9
    In mixed form: 12/9

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