Add 30/15 and 21/56
1st number: 2 0/15, 2nd number: 21/56
30/15 + 21/56 is 19/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 56 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 15 × 56 = 840,
30/15 = 30 × 56/15 × 56 = 1680/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
21/56 = 21 × 15/56 × 15 = 315/840 - Add the two like fractions:
1680/840 + 315/840 = 1680 + 315/840 = 1995/840 - 1995/840 simplified gives 19/8
- So, 30/15 + 21/56 = 19/8
In mixed form: 23/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15+21/56 30/15+42/56 90/15+21/56 30/15+63/56 30/45+21/56 30/75+21/56