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Add 12/42 and 70/80

12/42 + 70/80 is 65/56.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    12/42 = 12 × 40/42 × 40 = 480/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    70/80 = 70 × 21/80 × 21 = 1470/1680
  4. Add the two like fractions:
    480/1680 + 1470/1680 = 480 + 1470/1680 = 1950/1680
  5. 1950/1680 simplified gives 65/56
  6. So, 12/42 + 70/80 = 65/56
    In mixed form: 19/56

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