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Add 18/40 and 18/21

18/40 + 18/21 is 183/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 21 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 40 × 21 = 840,
    18/40 = 18 × 21/40 × 21 = 378/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    18/21 = 18 × 40/21 × 40 = 720/840
  4. Add the two like fractions:
    378/840 + 720/840 = 378 + 720/840 = 1098/840
  5. 1098/840 simplified gives 183/140
  6. So, 18/40 + 18/21 = 183/140
    In mixed form: 143/140

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