Add 21/9 and 81/20
1st number: 2 3/9, 2nd number: 4 1/20
21/9 + 81/20 is 383/60.
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,
81/20 = 81 × 9/20 × 9 = 729/180 - Add the two like fractions:
420/180 + 729/180 = 420 + 729/180 = 1149/180 - 1149/180 simplified gives 383/60
- So, 21/9 + 81/20 = 383/60
In mixed form: 623/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+81/20 21/18+81/20 21/9+81/40 63/9+81/20 21/27+81/20 21/9+81/60 21/45+81/20 21/63+81/20