Add 21/15 and 54/30
1st number: 1 6/15, 2nd number: 1 24/30
21/15 + 54/30 is 16/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
54/30 = 54 × 1/30 × 1 = 54/30 - Add the two like fractions:
42/30 + 54/30 = 42 + 54/30 = 96/30 - 96/30 simplified gives 16/5
- So, 21/15 + 54/30 = 16/5
In mixed form: 31/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+54/30 21/30+54/30 21/15+54/60 63/15+54/30 21/45+54/30 21/15+54/90 21/75+54/30