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Add 21/12 and 30/28

1st number: 1 9/12, 2nd number: 1 2/28

21/12 + 30/28 is 79/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 28 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 12 × 7 = 84,
    21/12 = 21 × 7/12 × 7 = 147/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    30/28 = 30 × 3/28 × 3 = 90/84
  4. Add the two like fractions:
    147/84 + 90/84 = 147 + 90/84 = 237/84
  5. 237/84 simplified gives 79/28
  6. So, 21/12 + 30/28 = 79/28
    In mixed form: 223/28

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