Add 21/80 and 21/9
1st number: 21/80, 2nd number: 2 3/9
21/80 + 21/9 is 623/240.
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,
21/9 = 21 × 80/9 × 80 = 1680/720 - Add the two like fractions:
189/720 + 1680/720 = 189 + 1680/720 = 1869/720 - 1869/720 simplified gives 623/240
- So, 21/80 + 21/9 = 623/240
In mixed form: 2143/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+21/9 21/80+42/9 21/80+21/18 63/80+21/9 21/80+63/9 21/80+21/27 21/80+21/45 21/80+21/63