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Add 21/84 and 54/70

21/84 + 54/70 is 143/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 70 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 70 × 6 = 420,
    54/70 = 54 × 6/70 × 6 = 324/420
  4. Add the two fractions:
    105/420 + 324/420 = 105 + 324/420 = 429/420
  5. After reducing the fraction, the answer is 143/140
  6. In mixed form: 13/140

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