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Add 75/80 and 42/70

75/80 + 42/70 is 123/80.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 70 is 560

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 80 × 7 = 560,
    75/80 = 75 × 7/80 × 7 = 525/560
  3. Likewise, for the 2nd fraction, since 70 × 8 = 560,
    42/70 = 42 × 8/70 × 8 = 336/560
  4. Add the two like fractions:
    525/560 + 336/560 = 525 + 336/560 = 861/560
  5. 861/560 simplified gives 123/80
  6. So, 75/80 + 42/70 = 123/80
    In mixed form: 143/80

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