Add 21/15 and 5/56
1st number: 1 6/15, 2nd number: 5/56
21/15 + 5/56 is 417/280.
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,
5/56 = 5 × 15/56 × 15 = 75/840 - Add the two like fractions:
1176/840 + 75/840 = 1176 + 75/840 = 1251/840 - 1251/840 simplified gives 417/280
- So, 21/15 + 5/56 = 417/280
In mixed form: 1137/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+5/56 21/15+10/56 21/30+5/56 63/15+5/56 21/15+15/56 21/45+5/56 21/15+25/56 21/75+5/56 21/15+35/56