Add 21/9 and 56/20
1st number: 2 3/9, 2nd number: 2 16/20
21/9 + 56/20 is 77/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
21/9 = 21 × 20/9 × 20 = 420/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
56/20 = 56 × 9/20 × 9 = 504/180 - Add the two like fractions:
420/180 + 504/180 = 420 + 504/180 = 924/180 - 924/180 simplified gives 77/15
- So, 21/9 + 56/20 = 77/15
In mixed form: 52/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+56/20 21/18+56/20 21/9+56/40 63/9+56/20 21/27+56/20 21/9+56/60 21/45+56/20 21/63+56/20