Add 3/15 and 21/12
1st number: 3/15, 2nd number: 1 9/12
3/15 + 21/12 is 39/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
3/15 = 3 × 4/15 × 4 = 12/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Add the two like fractions:
12/60 + 105/60 = 12 + 105/60 = 117/60 - 117/60 simplified gives 39/20
- So, 3/15 + 21/12 = 39/20
In mixed form: 119/20
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