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Add 3/12 and 9/45

3/12 + 9/45 is 9/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 45 is 180
  2. For the 1st fraction, since 12 × 15 = 180,
    3/12 = 3 × 15/12 × 15 = 45/180
  3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
    9/45 = 9 × 4/45 × 4 = 36/180
  4. Add the two fractions:
    45/180 + 36/180 = 45 + 36/180 = 81/180
  5. 81/180 simplified gives 9/20
  6. So, 3/12 + 9/45 = 9/20

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