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Add 1/28 and 1/21

1/28 + 1/21 is 1/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 21 is 84
  2. For the 1st fraction, since 28 × 3 = 84,
    1/28 = 1 × 3/28 × 3 = 3/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    1/21 = 1 × 4/21 × 4 = 4/84
  4. Add the two fractions:
    3/84 + 4/84 = 3 + 4/84 = 7/84
  5. 7/84 simplified gives 1/12
  6. So, 1/28 + 1/21 = 1/12

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