Add 21/15 and 18/56
1st number: 1 6/15, 2nd number: 18/56
21/15 + 18/56 is 241/140.
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,
21/15 = 21 × 56/15 × 56 = 1176/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
18/56 = 18 × 15/56 × 15 = 270/840 - Add the two like fractions:
1176/840 + 270/840 = 1176 + 270/840 = 1446/840 - 1446/840 simplified gives 241/140
- So, 21/15 + 18/56 = 241/140
In mixed form: 1101/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+18/56 21/15+36/56 21/30+18/56 63/15+18/56 21/15+54/56 21/45+18/56 21/15+90/56 21/75+18/56