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Add 21/80 and 63/84

21/80 + 63/84 is 81/80.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 84 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 80 × 21 = 1680,
    21/80 = 21 × 21/80 × 21 = 441/1680
  3. Likewise, for the 2nd fraction, since 84 × 20 = 1680,
    63/84 = 63 × 20/84 × 20 = 1260/1680
  4. Add the two like fractions:
    441/1680 + 1260/1680 = 441 + 1260/1680 = 1701/1680
  5. 1701/1680 simplified gives 81/80
  6. So, 21/80 + 63/84 = 81/80
    In mixed form: 11/80

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