Add 3/7 and 21/80
3/7 + 21/80 is 387/560.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 7 × 80 = 560,
3/7 = 3 × 80/7 × 80 = 240/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
21/80 = 21 × 7/80 × 7 = 147/560 - Add the two like fractions:
240/560 + 147/560 = 240 + 147/560 = 387/560 - So, 3/7 + 21/80 = 387/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7+21/80 3/7+42/80 3/14+21/80 9/7+21/80 3/7+63/80 3/21+21/80 15/7+21/80 3/35+21/80 21/7+21/80 3/49+21/80