Add 9/15 and 21/4
1st number: 9/15, 2nd number: 5 1/4
9/15 + 21/4 is 117/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 4 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
9/15 = 9 × 4/15 × 4 = 36/60 - Likewise, for the 2nd fraction, since 4 × 15 = 60,
21/4 = 21 × 15/4 × 15 = 315/60 - Add the two like fractions:
36/60 + 315/60 = 36 + 315/60 = 351/60 - 351/60 simplified gives 117/20
- So, 9/15 + 21/4 = 117/20
In mixed form: 517/20
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