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Add 21/42 and 45/84

21/42 + 45/84 is 29/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 84 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 42 × 2 = 84,
    21/42 = 21 × 2/42 × 2 = 42/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    45/84 = 45 × 1/84 × 1 = 45/84
  4. Add the two like fractions:
    42/84 + 45/84 = 42 + 45/84 = 87/84
  5. 87/84 simplified gives 29/28
  6. So, 21/42 + 45/84 = 29/28
    In mixed form: 11/28

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