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Add 56/80 and 15/21

56/80 + 15/21 is 99/70.

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,
    56/80 = 56 × 21/80 × 21 = 1176/1680
  3. Likewise, for the 2nd fraction, since 21 × 80 = 1680,
    15/21 = 15 × 80/21 × 80 = 1200/1680
  4. Add the two like fractions:
    1176/1680 + 1200/1680 = 1176 + 1200/1680 = 2376/1680
  5. 2376/1680 simplified gives 99/70
  6. So, 56/80 + 15/21 = 99/70
    In mixed form: 129/70

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