Add 18/30 and 21/4
1st number: 18/30, 2nd number: 5 1/4
18/30 + 21/4 is 117/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 4 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
18/30 = 18 × 2/30 × 2 = 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, 18/30 + 21/4 = 117/20
In mixed form: 517/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30+21/4 18/30+42/4 18/60+21/4 18/30+21/8 54/30+21/4 18/30+63/4 18/90+21/4 18/30+21/12 90/30+21/4 18/30+21/20 18/30+21/28