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Add 15/42 and 21/27

15/42 + 21/27 is 143/126.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 27 is 378

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 42 × 9 = 378,
    15/42 = 15 × 9/42 × 9 = 135/378
  3. Likewise, for the 2nd fraction, since 27 × 14 = 378,
    21/27 = 21 × 14/27 × 14 = 294/378
  4. Add the two like fractions:
    135/378 + 294/378 = 135 + 294/378 = 429/378
  5. 429/378 simplified gives 143/126
  6. So, 15/42 + 21/27 = 143/126
    In mixed form: 117/126

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