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Add 21/12 and 3/42

1st number: 1 9/12, 2nd number: 3/42

21/12 + 3/42 is 51/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 42 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 42 × 2 = 84,
    3/42 = 3 × 2/42 × 2 = 6/84
  4. Add the two like fractions:
    147/84 + 6/84 = 147 + 6/84 = 153/84
  5. 153/84 simplified gives 51/28
  6. So, 21/12 + 3/42 = 51/28
    In mixed form: 123/28

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