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Add 18/70 and 75/80

18/70 + 75/80 is 669/560.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 70 × 8 = 560,
    18/70 = 18 × 8/70 × 8 = 144/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    75/80 = 75 × 7/80 × 7 = 525/560
  4. Add the two like fractions:
    144/560 + 525/560 = 144 + 525/560 = 669/560
  5. So, 18/70 + 75/80 = 669/560
    In mixed form: 1109/560

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