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Add 3/21 and 9/80

3/21 + 9/80 is 143/560.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 80 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 21 × 80 = 1680,
    3/21 = 3 × 80/21 × 80 = 240/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    9/80 = 9 × 21/80 × 21 = 189/1680
  4. Add the two like fractions:
    240/1680 + 189/1680 = 240 + 189/1680 = 429/1680
  5. 429/1680 simplified gives 143/560
  6. So, 3/21 + 9/80 = 143/560

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