Add 21/80 and 18/9
1st number: 21/80, 2nd number: 2 0/9
21/80 + 18/9 is 181/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 9 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Likewise, for the 2nd fraction, since 9 × 80 = 720,
18/9 = 18 × 80/9 × 80 = 1440/720 - Add the two like fractions:
189/720 + 1440/720 = 189 + 1440/720 = 1629/720 - 1629/720 simplified gives 181/80
- So, 21/80 + 18/9 = 181/80
In mixed form: 221/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+18/9 21/80+36/9 63/80+18/9 21/80+54/9 21/80+18/27 21/80+90/9 21/80+18/45 21/80+18/63