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Add 21/28 and 54/70

21/28 + 54/70 is 213/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 70 is 140
  2. For the 1st fraction, since 28 × 5 = 140,
    21/28 = 21 × 5/28 × 5 = 105/140
  3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
    54/70 = 54 × 2/70 × 2 = 108/140
  4. Add the two fractions:
    105/140 + 108/140 = 105 + 108/140 = 213/140
  5. In mixed form: 173/140

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