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Add 18/21 and 10/20

18/21 + 10/20 is 19/14.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    18/21 = 18 × 20/21 × 20 = 360/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    10/20 = 10 × 21/20 × 21 = 210/420
  4. Add the two like fractions:
    360/420 + 210/420 = 360 + 210/420 = 570/420
  5. 570/420 simplified gives 19/14
  6. So, 18/21 + 10/20 = 19/14
    In mixed form: 15/14

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