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Add 21/80 and 9/84

21/80 + 9/84 is 207/560.

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,
    9/84 = 9 × 20/84 × 20 = 180/1680
  4. Add the two like fractions:
    441/1680 + 180/1680 = 441 + 180/1680 = 621/1680
  5. 621/1680 simplified gives 207/560
  6. So, 21/80 + 9/84 = 207/560

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