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Add 21/42 and 15/18

21/42 + 15/18 is 4/3.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 18 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 42 × 3 = 126,
    21/42 = 21 × 3/42 × 3 = 63/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    15/18 = 15 × 7/18 × 7 = 105/126
  4. Add the two like fractions:
    63/126 + 105/126 = 63 + 105/126 = 168/126
  5. 168/126 simplified gives 4/3
  6. So, 21/42 + 15/18 = 4/3
    In mixed form: 11/3

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