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Add 18/20 and 27/70

18/20 + 27/70 is 9/7.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 70 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 20 × 7 = 140,
    18/20 = 18 × 7/20 × 7 = 126/140
  3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
    27/70 = 27 × 2/70 × 2 = 54/140
  4. Add the two like fractions:
    126/140 + 54/140 = 126 + 54/140 = 180/140
  5. 180/140 simplified gives 9/7
  6. So, 18/20 + 27/70 = 9/7
    In mixed form: 12/7

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