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Add 18/20 and 18/21

18/20 + 18/21 is 123/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    18/20 = 18 × 21/20 × 21 = 378/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    18/21 = 18 × 20/21 × 20 = 360/420
  4. Add the two like fractions:
    378/420 + 360/420 = 378 + 360/420 = 738/420
  5. 738/420 simplified gives 123/70
  6. So, 18/20 + 18/21 = 123/70
    In mixed form: 153/70

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