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Add 18/45 and 3/12

18/45 + 3/12 is 13/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 12 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 45 × 4 = 180,
    18/45 = 18 × 4/45 × 4 = 72/180
  3. Likewise, for the 2nd fraction, since 12 × 15 = 180,
    3/12 = 3 × 15/12 × 15 = 45/180
  4. Add the two like fractions:
    72/180 + 45/180 = 72 + 45/180 = 117/180
  5. 117/180 simplified gives 13/20
  6. So, 18/45 + 3/12 = 13/20

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