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Add 27/42 and 70/80

27/42 + 70/80 is 85/56.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    27/42 = 27 × 40/42 × 40 = 1080/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    70/80 = 70 × 21/80 × 21 = 1470/1680
  4. Add the two fractions:
    1080/1680 + 1470/1680 = 1080 + 1470/1680 = 2550/1680
  5. After reducing the fraction, the answer is 85/56
  6. In mixed form: 129/56

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