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Add 24/27 and 21/42

24/27 + 21/42 is 25/18.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 27 × 14 = 378,
    24/27 = 24 × 14/27 × 14 = 336/378
  3. Likewise, for the 2nd fraction, since 42 × 9 = 378,
    21/42 = 21 × 9/42 × 9 = 189/378
  4. Add the two like fractions:
    336/378 + 189/378 = 336 + 189/378 = 525/378
  5. 525/378 simplified gives 25/18
  6. So, 24/27 + 21/42 = 25/18
    In mixed form: 17/18

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