Add 54/7 and 21/9
1st number: 7 5/7, 2nd number: 2 3/9
54/7 + 21/9 is 211/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
54/7 = 54 × 9/7 × 9 = 486/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
21/9 = 21 × 7/9 × 7 = 147/63 - Add the two like fractions:
486/63 + 147/63 = 486 + 147/63 = 633/63 - 633/63 simplified gives 211/21
- So, 54/7 + 21/9 = 211/21
In mixed form: 101/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/7+42/9 54/14+21/9 54/7+21/18 54/7+63/9 54/21+21/9 54/7+21/27 54/35+21/9 54/7+21/45 54/49+21/9 54/7+21/63