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Add 18/21 and 40/48

18/21 + 40/48 is 71/42.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 48 is 336

    Next, find the equivalent fraction of both fractional numbers with denominator 336
  2. For the 1st fraction, since 21 × 16 = 336,
    18/21 = 18 × 16/21 × 16 = 288/336
  3. Likewise, for the 2nd fraction, since 48 × 7 = 336,
    40/48 = 40 × 7/48 × 7 = 280/336
  4. Add the two like fractions:
    288/336 + 280/336 = 288 + 280/336 = 568/336
  5. 568/336 simplified gives 71/42
  6. So, 18/21 + 40/48 = 71/42
    In mixed form: 129/42

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