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Add 72/80 and 2/21

72/80 + 2/21 is 209/210.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 80 × 21 = 1680,
    72/80 = 72 × 21/80 × 21 = 1512/1680
  3. Likewise, for the 2nd fraction, since 21 × 80 = 1680,
    2/21 = 2 × 80/21 × 80 = 160/1680
  4. Add the two like fractions:
    1512/1680 + 160/1680 = 1512 + 160/1680 = 1672/1680
  5. 1672/1680 simplified gives 209/210
  6. So, 72/80 + 2/21 = 209/210

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