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Add 10/12 and 21/42

10/12 + 21/42 is 4/3.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 42 is 84
  2. For the 1st fraction, since 12 × 7 = 84,
    10/12 = 10 × 7/12 × 7 = 70/84
  3. Likewise, for the 2nd fraction, since 42 × 2 = 84,
    21/42 = 21 × 2/42 × 2 = 42/84
  4. Add the two fractions:
    70/84 + 42/84 = 70 + 42/84 = 112/84
  5. After reducing the fraction, the answer is 4/3
  6. In mixed form: 11/3

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