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Add 18/20 and 21/84

18/20 + 21/84 is 23/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 84 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 84 × 5 = 420,
    21/84 = 21 × 5/84 × 5 = 105/420
  4. Add the two like fractions:
    378/420 + 105/420 = 378 + 105/420 = 483/420
  5. 483/420 simplified gives 23/20
  6. So, 18/20 + 21/84 = 23/20
    In mixed form: 13/20

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