Add 45/12 and 72/15
1st number: 3 9/12, 2nd number: 4 12/15
45/12 + 72/15 is 171/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
45/12 = 45 × 5/12 × 5 = 225/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
72/15 = 72 × 4/15 × 4 = 288/60 - Add the two like fractions:
225/60 + 288/60 = 225 + 288/60 = 513/60 - 513/60 simplified gives 171/20
- So, 45/12 + 72/15 = 171/20
In mixed form: 811/20
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